WEIGEL電流表RW96MIN翊霈優質供應

WEIGEL電流表RW96MIN翊霈優質供應

傳(chuan)統(tong)的指(zhi)針式電(dian)壓(ya)表(biao)和電(dian)流(liu)(liu)表(biao)都(dou)是根據一個原理就(jiu)是電(dian)流(liu)(liu)的磁效(xiao)應。電(dian)流(liu)(liu)越(yue)(yue)(yue)大(da)，所產生(sheng)的磁力越(yue)(yue)(yue)大(da)，表(biao)現出的就(jiu)是電(dian)壓(ya)表(biao)上的指(zhi)針的擺幅越(yue)(yue)(yue)大(da)，電(dian)壓(ya)表(biao)內有一個磁鐵(tie)和一個導(dao)線(xian)線(xian)圈(quan)，通過電(dian)流(liu)(liu)后，會使線(xian)圈(quan)產生(sheng)磁場，線(xian)圈(quan)通電(dian)后在磁鐵(tie)的作用下會發生(sheng)偏轉(zhuan)，這就(jiu)是電(dian)流(liu)(liu)表(biao)、電(dian)壓(ya)表(biao)的表(biao)頭部分。
由于電(dian)(dian)(dian)(dian)壓表要與被測電(dian)(dian)(dian)(dian)阻(zu)并聯(lian)(lian)，所(suo)以(yi)如果直接(jie)用靈(ling)敏電(dian)(dian)(dian)(dian)流(liu)(liu)計當電(dian)(dian)(dian)(dian)壓表用，表中的電(dian)(dian)(dian)(dian)流(liu)(liu)過(guo)大，會(hui)燒壞電(dian)(dian)(dian)(dian)表，這時需要在(zai)電(dian)(dian)(dian)(dian)壓表的內部電(dian)(dian)(dian)(dian)路(lu)中串聯(lian)(lian)一個很(hen)大的電(dian)(dian)(dian)(dian)阻(zu)，這樣改造后，當電(dian)(dian)(dian)(dian)壓表再并聯(lian)(lian)在(zai)電(dian)(dian)(dian)(dian)路(lu)中時，由于電(dian)(dian)(dian)(dian)阻(zu)的作用，加在(zai)電(dian)(dian)(dian)(dian)表兩端的電(dian)(dian)(dian)(dian)壓絕(jue)大部分都被這個串聯(lian)(lian)的電(dian)(dian)(dian)(dian)阻(zu)分擔了，所(suo)以(yi)通(tong)過(guo)電(dian)(dian)(dian)(dian)表的電(dian)(dian)(dian)(dian)流(liu)(liu)實際上(shang)很(hen)小，所(suo)以(yi)就可(ke)以(yi)正常使用了。
?主要(yao)(yao)采(cai)用(yong)(yong)(yong)(yong)(yong)磁(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)和(he)(he)靜(jing)(jing)(jing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)。磁(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)由(you)小量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)磁(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)與(yu)串聯(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)(qi)(qi)(qi)(qi)(又(you)(you)稱(cheng)分(fen)(fen)(fen)(fen)(fen)(fen)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)(qi)(qi))組成(cheng)(cheng)(cheng)，低(di)(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)為(wei)(wei)(wei)十(shi)(shi)幾(ji)毫(hao)伏。為(wei)(wei)(wei)了(le)(le)(le)(le)擴大(da)(da)(da)(da)(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)，可(ke)(ke)以(yi)增大(da)(da)(da)(da)(da)分(fen)(fen)(fen)(fen)(fen)(fen)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)。例(li)如用(yong)(yong)(yong)(yong)(yong)50微安的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)形成(cheng)(cheng)(cheng)250伏的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)時(shi)，要(yao)(yao)使(shi)(shi)分(fen)(fen)(fen)(fen)(fen)(fen)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)(qi)(qi)與(yu)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)總電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)為(wei)(wei)(wei)250/[50×10^(-6)]=5×10^6歐(ou)=5兆(zhao)歐(ou)，這(zhe)相當于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)內阻(zu)(zu)(zu)為(wei)(wei)(wei)20千歐(ou)/伏。為(wei)(wei)(wei)了(le)(le)(le)(le)避(bi)免電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)接(jie)入過多(duo)影響原工作(zuo)狀態，要(yao)(yao)求電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)有(you)較高(gao)(gao)(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)內阻(zu)(zu)(zu)。用(yong)(yong)(yong)(yong)(yong)幾(ji)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)組成(cheng)(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)(fen)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)(qi)(qi)和(he)(he)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)串聯(lian)(lian)，可(ke)(ke)形成(cheng)(cheng)(cheng)多(duo)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)。靜(jing)(jing)(jing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)低(di)(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)為(wei)(wei)(wei)幾(ji)十(shi)(shi)伏，擴大(da)(da)(da)(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)是(shi)(shi)(shi)靠改(gai)變(bian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)內部(bu)結(jie)構(gou)(gou)和(he)(he)極(ji)間(jian)距離(li)來(lai)達到。此外，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)在(zai)(zai)理論上(shang)(shang)也可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)于(yu)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)。?電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)是(shi)(shi)(shi)個(ge)大(da)(da)(da)(da)(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)(qi)(qi)(qi)(qi)，理想的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)認(ren)為(wei)(wei)(wei)是(shi)(shi)(shi)斷路(lu)。在(zai)(zai)并(bing)(bing)(bing)聯(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)中并(bing)(bing)(bing)聯(lian)(lian)了(le)(le)(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)(跟(gen)別的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)并(bing)(bing)(bing)聯(lian)(lian))和(he)(he)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)，如果在(zai)(zai)干路(lu)中沒有(you)其(qi)他的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)，可(ke)(ke)以(yi)認(ren)為(wei)(wei)(wei)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(因(yin)為(wei)(wei)(wei)并(bing)(bing)(bing)聯(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)上(shang)(shang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)全部(bu)享(xiang)用(yong)(yong)(yong)(yong)(yong)了(le)(le)(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya))；如果干路(lu)中還連(lian)接(jie)其(qi)他的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)，那(nei)這(zhe)個(ge)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)就(jiu)(jiu)分(fen)(fen)(fen)(fen)(fen)(fen)享(xiang)了(le)(le)(le)(le)部(bu)分(fen)(fen)(fen)(fen)(fen)(fen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)，那(nei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)只能(neng)是(shi)(shi)(shi)部(bu)分(fen)(fen)(fen)(fen)(fen)(fen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(連(lian)接(jie)在(zai)(zai)哪(na)個(ge)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)就(jiu)(jiu)是(shi)(shi)(shi)哪(na)個(ge)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya))。進行研究(jiu)，他發(fa)明(ming)(ming)(ming)了(le)(le)(le)(le)許多(duo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)儀器(qi)(qi)(qi)(qi)(qi)。1841年發(fa)明(ming)(ming)(ming)了(le)(le)(le)(le)既(ji)可(ke)(ke)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)地磁(ci)(ci)(ci)(ci)強度(du)(du)又(you)(you)可(ke)(ke)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)學(xue)單(dan)(dan)位(wei)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)雙線(xian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)；1846年發(fa)明(ming)(ming)(ming)了(le)(le)(le)(le)既(ji)可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)來(lai)確(que)定(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)力(li)學(xue)單(dan)(dan)位(wei)又(you)(you)可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)來(lai)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)功率(lv)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)功率(lv)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)；1853年發(fa)明(ming)(ming)(ming)了(le)(le)(le)(le)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)地磁(ci)(ci)(ci)(ci)強度(du)(du)垂直(zhi)(zhi)(zhi)分(fen)(fen)(fen)(fen)(fen)(fen)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)地磁(ci)(ci)(ci)(ci)感(gan)應器(qi)(qi)(qi)(qi)(qi)。韋伯(bo)在(zai)(zai)建立電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)學(xue)單(dan)(dan)位(wei)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)方面卓有(you)成(cheng)(cheng)(cheng)效。他提(ti)出(chu)了(le)(le)(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強度(du)(du)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)和(he)(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)勢的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)單(dan)(dan)位(wei)和(he)(he)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)方法；根據安培的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)力(li)學(xue)公式(shi)(shi)提(ti)出(chu)了(le)(le)(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)力(li)學(xue)單(dan)(dan)位(wei)；還提(ti)出(chu)了(le)(le)(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)單(dan)(dan)位(wei)。韋伯(bo)與(yu)柯爾勞施合作(zuo)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)定(ding)了(le)(le)(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)單(dan)(dan)位(wei)對(dui)(dui)靜(jing)(jing)(jing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)單(dan)(dan)位(wei)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)比值(zhi)(zhi)，發(fa)現這(zhe)個(ge)比值(zhi)(zhi)等(deng)于(yu)3×10^8m/s，接(jie)近于(yu)光速。直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)主要(yao)(yao)采(cai)用(yong)(yong)(yong)(yong)(yong)磁(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)或電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)系(xi)(xi)(xi)(xi)(xi)(xi)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)(見機(ji)(ji)械式(shi)(shi)指示電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou))，這(zhe)些測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)基本量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)是(shi)(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)，可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)來(lai)直(zhi)(zhi)(zhi)接(jie)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)小電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)。對(dui)(dui)于(yu)大(da)(da)(da)(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)值(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)，磁(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)要(yao)(yao)使(shi)(shi)用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)，也就(jiu)(jiu)是(shi)(shi)(shi)并(bing)(bing)(bing)聯(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)。它的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)作(zuo)用(yong)(yong)(yong)(yong)(yong)是(shi)(shi)(shi)將大(da)(da)(da)(da)(da)部(bu)分(fen)(fen)(fen)(fen)(fen)(fen)被測(ce)(ce)(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)分(fen)(fen)(fen)(fen)(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)。對(dui)(dui)約10A以(yi)下(xia)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)多(duo)采(cai)用(yong)(yong)(yong)(yong)(yong)內附分(fen)(fen)(fen)(fen)(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi);對(dui)(dui)更大(da)(da)(da)(da)(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)值(zhi)(zhi)，則(ze)使(shi)(shi)用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)。它采(cai)取四(si)端(duan)(duan)結(jie)構(gou)(gou)(圖a)，具有(you)兩個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)端(duan)(duan)，兩個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)端(duan)(duan)。其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)選擇條件(jian)為(wei)(wei)(wei)：當標稱(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)通(tong)過該分(fen)(fen)(fen)(fen)(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)時(shi)，其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)端(duan)(duan)間(jian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)為(wei)(wei)(wei)45mV或75mV;以(yi)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)為(wei)(wei)(wei)45mV或75mV的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)磁(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)(xi)(xi)毫(hao)伏表(biao)(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)此電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)值(zhi)(zhi)，而表(biao)(biao)(biao)(biao)(biao)(biao)(biao)盤上(shang)(shang)則(ze)以(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)值(zhi)(zhi)刻度(du)(du)。對(dui)(dui)于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)系(xi)(xi)(xi)(xi)(xi)(xi)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)，擴大(da)(da)(da)(da)(da)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)方法是(shi)(shi)(shi)：①加(jia)粗(cu)靜(jing)(jing)(jing)圈(quan)(quan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)導(dao)線(xian)，同時(shi)減少(shao)匝(za)數(shu)(shu)以(yi)保持(chi)安匝(za)值(zhi)(zhi)不(bu)變(bian);②將兩靜(jing)(jing)(jing)圈(quan)(quan)由(you)串聯(lian)(lian)改(gai)為(wei)(wei)(wei)并(bing)(bing)(bing)聯(lian)(lian)[圖(b)、(c)]，可(ke)(ke)使(shi)(shi)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)擴大(da)(da)(da)(da)(da)一(yi)倍(bei)。利用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)和(he)(he)數(shu)(shu)字電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)可(ke)(ke)構(gou)(gou)成(cheng)(cheng)(cheng)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)數(shu)(shu)字電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)。交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)主要(yao)(yao)采(cai)用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)和(he)(he)整流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)式(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)系(xi)(xi)(xi)(xi)(xi)(xi)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)低(di)(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)約為(wei)(wei)(wei)幾(ji)十(shi)(shi)毫(hao)安，為(wei)(wei)(wei)提(ti)高(gao)(gao)(gao)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)，要(yao)(yao)按比例(li)減少(shao)線(xian)圈(quan)(quan)匝(za)數(shu)(shu)，并(bing)(bing)(bing)加(jia)粗(cu)導(dao)線(xian)。用(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)系(xi)(xi)(xi)(xi)(xi)(xi)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)構(gou)(gou)成(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)時(shi)，動(dong)(dong)圈(quan)(quan)與(yu)靜(jing)(jing)(jing)圈(quan)(quan)并(bing)(bing)(bing)聯(lian)(lian)，其(qi)低(di)(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)約為(wei)(wei)(wei)幾(ji)十(shi)(shi)毫(hao)安。為(wei)(wei)(wei)提(ti)高(gao)(gao)(gao)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)，要(yao)(yao)減少(shao)靜(jing)(jing)(jing)圈(quan)(quan)匝(za)數(shu)(shu)，并(bing)(bing)(bing)加(jia)粗(cu)導(dao)線(xian)，或將兩個(ge)靜(jing)(jing)(jing)圈(quan)(quan)由(you)串聯(lian)(lian)改(gai)為(wei)(wei)(wei)并(bing)(bing)(bing)聯(lian)(lian)，則(ze)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)將增大(da)(da)(da)(da)(da)一(yi)倍(bei)。用(yong)(yong)(yong)(yong)(yong)整流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)式(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)時(shi)，僅(jin)當交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)為(wei)(wei)(wei)正(zheng)弦波形時(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)讀數(shu)(shu)才正(zheng)確(que)。為(wei)(wei)(wei)擴大(da)(da)(da)(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)也可(ke)(ke)利用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)。此外，也可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)熱電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)式(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(gou)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)高(gao)(gao)(gao)頻電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)。在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)系(xi)(xi)(xi)(xi)(xi)(xi)統中使(shi)(shi)用(yong)(yong)(yong)(yong)(yong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)大(da)(da)(da)(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)多(duo)是(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)5A或1A的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)系(xi)(xi)(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)(biao)，并(bing)(bing)(bing)配以(yi)適當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)變(bian)比的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)互感(gan)器(qi)(qi)(qi)(qi)(qi)。???
要知道在電(dian)壓表內，有(you)一(yi)個(ge)磁(ci)(ci)鐵和一(yi)個(ge)導線線圈(quan)，通過電(dian)流后，會使線圈(quan)產(chan)生磁(ci)(ci)場，這(zhe)樣線圈(quan)通電(dian)后在磁(ci)(ci)鐵的作用下會旋轉，這(zhe)就是電(dian)流表、電(dian)壓表的表頭部分。
這個(ge)表(biao)(biao)頭(tou)所能(neng)通(tong)過(guo)的電(dian)流(liu)很(hen)小(xiao)，兩(liang)端所能(neng)承受的電(dian)壓(ya)也很(hen)小(xiao)（肯定遠小(xiao)于(yu)(yu)1V，可能(neng)只有(you)零點零幾(ji)伏(fu)甚(shen)至更小(xiao)），為了(le)(le)(le)能(neng)測量實際電(dian)路中的電(dian)壓(ya)，需要給這個(ge)電(dian)壓(ya)表(biao)(biao)串聯一(yi)個(ge)比較大(da)(da)(da)的電(dian)阻(zu)，做成電(dian)壓(ya)表(biao)(biao)。這樣(yang)，即使兩(liang)端加(jia)上比較大(da)(da)(da)的電(dian)壓(ya)，可是大(da)(da)(da)部(bu)(bu)分電(dian)壓(ya)都作用(yong)(yong)在加(jia)的那個(ge)大(da)(da)(da)電(dian)阻(zu)上了(le)(le)(le)，表(biao)(biao)頭(tou)上的電(dian)壓(ya)就會(hui)很(hen)小(xiao)了(le)(le)(le)。電(dian)壓(ya)表(biao)(biao)是一(yi)種內部(bu)(bu)電(dian)阻(zu)很(hen)大(da)(da)(da)的儀器(qi)，一(yi)般應(ying)該大(da)(da)(da)于(yu)(yu)幾(ji)千歐。表(biao)(biao)頭(tou)是跟據通(tong)電(dian)導(dao)體在磁(ci)場(chang)中受磁(ci)場(chang)力的作用(yong)(yong)而制成的。表(biao)(biao)內部(bu)(bu)有(you)一(yi)永磁(ci)體，在極間產(chan)生磁(ci)場(chang)，在磁(ci)場(chang)中有(you)一(yi)個(ge)線圈，線圈兩(liang)端各有(you)一(yi)個(ge)游絲彈(dan)(dan)簧，彈(dan)(dan)簧各連接(jie)(jie)表(biao)(biao)的一(yi)個(ge)接(jie)(jie)線柱，在彈(dan)(dan)簧與(yu)線圈間由(you)一(yi)個(ge)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)軸(zhou)連接(jie)(jie)，在轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)軸(zhou)相對于(yu)(yu)電(dian)流(liu)表(biao)(biao)的前端，有(you)一(yi)個(ge)指針。當有(you)電(dian)流(liu)通(tong)過(guo)時，電(dian)流(liu)沿彈(dan)(dan)簧、轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)軸(zhou)通(tong)過(guo)磁(ci)場(chang)，電(dian)流(liu)切磁(ci)感線，所以受磁(ci)場(chang)力的作用(yong)(yong)，使線圈發生偏(pian)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)，帶動轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)軸(zhou)、指針偏(pian)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)。由(you)于(yu)(yu)磁(ci)場(chang)力的大(da)(da)(da)小(xiao)隨(sui)電(dian)流(liu)增(zeng)大(da)(da)(da)而增(zeng)大(da)(da)(da)，所以就可以通(tong)過(guo)指針的偏(pian)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)程度(du)來觀(guan)察電(dian)流(liu)的大(da)(da)(da)小(xiao)。

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傳統的(de)指針式電(dian)(dian)(dian)壓(ya)表(biao)(biao)和電(dian)(dian)(dian)流(liu)(liu)表(biao)(biao)都是根據(ju)一個(ge)原理(li)就是電(dian)(dian)(dian)流(liu)(liu)的(de)磁(ci)效應。電(dian)(dian)(dian)流(liu)(liu)越(yue)大，所產生的(de)磁(ci)力越(yue)大，表(biao)(biao)現出的(de)就是電(dian)(dian)(dian)壓(ya)表(biao)(biao)上的(de)指針的(de)擺幅(fu)越(yue)大，電(dian)(dian)(dian)壓(ya)表(biao)(biao)內(nei)有(you)一個(ge)磁(ci)鐵和一個(ge)導線(xian)線(xian)圈(quan)，通過電(dian)(dian)(dian)流(liu)(liu)后，會(hui)使線(xian)圈(quan)產生磁(ci)場，線(xian)圈(quan)通電(dian)(dian)(dian)后在磁(ci)鐵的(de)作用下會(hui)發生偏轉，這就是電(dian)(dian)(dian)流(liu)(liu)表(biao)(biao)、電(dian)(dian)(dian)壓(ya)表(biao)(biao)的(de)表(biao)(biao)頭部分(fen)。
由(you)于(yu)電(dian)(dian)(dian)(dian)壓表(biao)(biao)要(yao)(yao)與(yu)被測電(dian)(dian)(dian)(dian)阻并聯(lian)，所以如(ru)果直接(jie)用靈敏電(dian)(dian)(dian)(dian)流(liu)計(ji)當電(dian)(dian)(dian)(dian)壓表(biao)(biao)用，表(biao)(biao)中的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)過大(da)(da)，會燒壞電(dian)(dian)(dian)(dian)表(biao)(biao)，這時需要(yao)(yao)在電(dian)(dian)(dian)(dian)壓表(biao)(biao)的(de)(de)(de)內部電(dian)(dian)(dian)(dian)路中串(chuan)聯(lian)一個(ge)(ge)很(hen)(hen)大(da)(da)的(de)(de)(de)電(dian)(dian)(dian)(dian)阻，這樣改造后(hou)，當電(dian)(dian)(dian)(dian)壓表(biao)(biao)再并聯(lian)在電(dian)(dian)(dian)(dian)路中時，由(you)于(yu)電(dian)(dian)(dian)(dian)阻的(de)(de)(de)作(zuo)用，加(jia)在電(dian)(dian)(dian)(dian)表(biao)(biao)兩(liang)端的(de)(de)(de)電(dian)(dian)(dian)(dian)壓絕大(da)(da)部分都被這個(ge)(ge)串(chuan)聯(lian)的(de)(de)(de)電(dian)(dian)(dian)(dian)阻分擔(dan)了(le)(le)，所以通(tong)過電(dian)(dian)(dian)(dian)表(biao)(biao)的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)實際上很(hen)(hen)小，所以就可(ke)以正常使用了(le)(le)。
?主要(yao)(yao)采(cai)(cai)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)和(he)靜電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)。磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)由(you)小(xiao)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)與(yu)串聯(lian)(lian)(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)(又稱(cheng)分(fen)(fen)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi))組成(cheng)，低(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)為(wei)(wei)(wei)(wei)(wei)(wei)十(shi)幾毫(hao)伏(fu)(fu)。為(wei)(wei)(wei)(wei)(wei)(wei)了(le)(le)擴(kuo)(kuo)(kuo)大(da)(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)，可(ke)(ke)以增(zeng)大(da)(da)分(fen)(fen)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)(zhi)(zhi)。例如用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)50微安的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)形成(cheng)250伏(fu)(fu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)時(shi)，要(yao)(yao)使(shi)分(fen)(fen)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)與(yu)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)總電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)(zhi)(zhi)為(wei)(wei)(wei)(wei)(wei)(wei)250/[50×10^(-6)]=5×10^6歐=5兆歐，這相當于電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)內阻(zu)(zu)(zu)為(wei)(wei)(wei)(wei)(wei)(wei)20千歐/伏(fu)(fu)。為(wei)(wei)(wei)(wei)(wei)(wei)了(le)(le)避免電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)接(jie)(jie)入過(guo)多(duo)影響原(yuan)工作(zuo)(zuo)狀態(tai)，要(yao)(yao)求電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)有(you)(you)較高(gao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)內阻(zu)(zu)(zu)。用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)幾個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)組成(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)分(fen)(fen)壓(ya)(ya)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)和(he)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)串聯(lian)(lian)(lian)(lian)(lian)(lian)，可(ke)(ke)形成(cheng)多(duo)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)。靜電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)低(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)為(wei)(wei)(wei)(wei)(wei)(wei)幾十(shi)伏(fu)(fu)，擴(kuo)(kuo)(kuo)大(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)是(shi)(shi)(shi)靠改(gai)變電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)內部(bu)結(jie)構(gou)和(he)極間距離來達到。此外，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)在理(li)論(lun)上也(ye)可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)于測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)直(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)。?電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)是(shi)(shi)(shi)個(ge)大(da)(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)，理(li)想的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)認為(wei)(wei)(wei)(wei)(wei)(wei)是(shi)(shi)(shi)斷路(lu)。在并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)中并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian)了(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)(跟別(bie)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian))和(he)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)，如果在干路(lu)中沒有(you)(you)其(qi)他的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)，可(ke)(ke)以認為(wei)(wei)(wei)(wei)(wei)(wei)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(因為(wei)(wei)(wei)(wei)(wei)(wei)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)上的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)全部(bu)享用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)了(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya))；如果干路(lu)中還連(lian)接(jie)(jie)其(qi)他的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)，那(nei)這個(ge)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)就(jiu)(jiu)分(fen)(fen)享了(le)(le)部(bu)分(fen)(fen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，那(nei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)只(zhi)能(neng)是(shi)(shi)(shi)部(bu)分(fen)(fen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(連(lian)接(jie)(jie)在哪(na)個(ge)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)就(jiu)(jiu)是(shi)(shi)(shi)哪(na)個(ge)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya))。進行(xing)研究，他發(fa)(fa)(fa)明(ming)(ming)了(le)(le)許多(duo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)儀器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)。1841年(nian)發(fa)(fa)(fa)明(ming)(ming)了(le)(le)既(ji)可(ke)(ke)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)地磁(ci)(ci)強(qiang)度(du)又可(ke)(ke)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強(qiang)度(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)學(xue)單(dan)(dan)位(wei)(wei)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)雙線電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)；1846年(nian)發(fa)(fa)(fa)明(ming)(ming)了(le)(le)既(ji)可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)來確定電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強(qiang)度(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)力(li)學(xue)單(dan)(dan)位(wei)(wei)又可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)來測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)功率的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)功率表(biao)(biao)(biao)(biao)(biao)(biao)；1853年(nian)發(fa)(fa)(fa)明(ming)(ming)了(le)(le)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)地磁(ci)(ci)強(qiang)度(du)垂直(zhi)分(fen)(fen)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)地磁(ci)(ci)感應器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)。韋伯在建立電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)學(xue)單(dan)(dan)位(wei)(wei)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)方面卓(zhuo)有(you)(you)成(cheng)效。他提(ti)(ti)(ti)出(chu)(chu)了(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強(qiang)度(du)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢(shi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)單(dan)(dan)位(wei)(wei)和(he)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)方法(fa)；根據安培的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)力(li)學(xue)公(gong)式(shi)(shi)提(ti)(ti)(ti)出(chu)(chu)了(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)強(qiang)度(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)力(li)學(xue)單(dan)(dan)位(wei)(wei)；還提(ti)(ti)(ti)出(chu)(chu)了(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)單(dan)(dan)位(wei)(wei)。韋伯與(yu)柯爾勞施合作(zuo)(zuo)測(ce)(ce)定了(le)(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)單(dan)(dan)位(wei)(wei)對(dui)(dui)靜電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)單(dan)(dan)位(wei)(wei)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)比(bi)值(zhi)(zhi)(zhi)(zhi)，發(fa)(fa)(fa)現這個(ge)比(bi)值(zhi)(zhi)(zhi)(zhi)等于3×10^8m/s，接(jie)(jie)近于光速。直(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)主要(yao)(yao)采(cai)(cai)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)或電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)系(xi)(xi)(xi)(xi)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)(見機(ji)(ji)械(xie)式(shi)(shi)指示電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou))，這些測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)基本量(liang)(liang)(liang)(liang)(liang)(liang)(liang)是(shi)(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)，可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)來直(zhi)接(jie)(jie)測(ce)(ce)小(xiao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)。對(dui)(dui)于大(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)值(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)直(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)，磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)要(yao)(yao)使(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)分(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)，也(ye)就(jiu)(jiu)是(shi)(shi)(shi)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)。它的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)是(shi)(shi)(shi)將(jiang)大(da)(da)部(bu)分(fen)(fen)被測(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)分(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)。對(dui)(dui)約(yue)10A以下的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)多(duo)采(cai)(cai)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)內附分(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi);對(dui)(dui)更大(da)(da)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)值(zhi)(zhi)(zhi)(zhi)，則(ze)使(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)分(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)。它采(cai)(cai)取四端結(jie)構(gou)(圖a)，具(ju)有(you)(you)兩(liang)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)端，兩(liang)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)端。其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)選擇(ze)條件為(wei)(wei)(wei)(wei)(wei)(wei)：當標稱(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)通(tong)過(guo)該分(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)時(shi)，其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位(wei)(wei)端間的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為(wei)(wei)(wei)(wei)(wei)(wei)45mV或75mV;以量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)為(wei)(wei)(wei)(wei)(wei)(wei)45mV或75mV的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)(xi)毫(hao)伏(fu)(fu)表(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)此電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)值(zhi)(zhi)(zhi)(zhi)，而表(biao)(biao)(biao)(biao)(biao)(biao)盤上則(ze)以電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)值(zhi)(zhi)(zhi)(zhi)刻度(du)。對(dui)(dui)于電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)系(xi)(xi)(xi)(xi)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)，擴(kuo)(kuo)(kuo)大(da)(da)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)方法(fa)是(shi)(shi)(shi)：①加(jia)粗靜圈(quan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)導線，同時(shi)減少匝(za)數(shu)(shu)(shu)以保持安匝(za)值(zhi)(zhi)(zhi)(zhi)不變;②將(jiang)兩(liang)靜圈(quan)由(you)串聯(lian)(lian)(lian)(lian)(lian)(lian)改(gai)為(wei)(wei)(wei)(wei)(wei)(wei)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian)[圖(b)、(c)]，可(ke)(ke)使(shi)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)擴(kuo)(kuo)(kuo)大(da)(da)一倍。利用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)分(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)和(he)數(shu)(shu)(shu)字(zi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)(biao)(biao)可(ke)(ke)構(gou)成(cheng)直(zhi)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)數(shu)(shu)(shu)字(zi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)。交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)主要(yao)(yao)采(cai)(cai)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)和(he)整流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)式(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)系(xi)(xi)(xi)(xi)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)低(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)約(yue)為(wei)(wei)(wei)(wei)(wei)(wei)幾十(shi)毫(hao)安，為(wei)(wei)(wei)(wei)(wei)(wei)提(ti)(ti)(ti)高(gao)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)，要(yao)(yao)按比(bi)例減少線圈(quan)匝(za)數(shu)(shu)(shu)，并(bing)(bing)加(jia)粗導線。用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)系(xi)(xi)(xi)(xi)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)構(gou)成(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)時(shi)，動(dong)圈(quan)與(yu)靜圈(quan)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian)，其(qi)低(di)(di)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)約(yue)為(wei)(wei)(wei)(wei)(wei)(wei)幾十(shi)毫(hao)安。為(wei)(wei)(wei)(wei)(wei)(wei)提(ti)(ti)(ti)高(gao)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)，要(yao)(yao)減少靜圈(quan)匝(za)數(shu)(shu)(shu)，并(bing)(bing)加(jia)粗導線，或將(jiang)兩(liang)個(ge)靜圈(quan)由(you)串聯(lian)(lian)(lian)(lian)(lian)(lian)改(gai)為(wei)(wei)(wei)(wei)(wei)(wei)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)(lian)，則(ze)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)將(jiang)增(zeng)大(da)(da)一倍。用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)整流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)式(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)時(shi)，僅當交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)為(wei)(wei)(wei)(wei)(wei)(wei)正(zheng)弦波形時(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)讀數(shu)(shu)(shu)才正(zheng)確。為(wei)(wei)(wei)(wei)(wei)(wei)擴(kuo)(kuo)(kuo)大(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)也(ye)可(ke)(ke)利用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)分(fen)(fen)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)。此外，也(ye)可(ke)(ke)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)熱電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)式(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)(biao)(biao)(biao)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)機(ji)(ji)構(gou)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)高(gao)頻電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)。在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)系(xi)(xi)(xi)(xi)統中使(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)大(da)(da)量(liang)(liang)(liang)(liang)(liang)(liang)(liang)程(cheng)(cheng)(cheng)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)多(duo)是(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)(yong)5A或1A的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)系(xi)(xi)(xi)(xi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)表(biao)(biao)(biao)(biao)(biao)(biao)，并(bing)(bing)配以適當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)變比(bi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)(liu)互感器(qi)(qi)(qi)(qi)(qi)(qi)(qi)(qi)。???
要知道在電壓表(biao)內，有一個磁(ci)(ci)(ci)鐵和一個導線(xian)(xian)線(xian)(xian)圈(quan)(quan)，通過電流后，會(hui)使線(xian)(xian)圈(quan)(quan)產生磁(ci)(ci)(ci)場，這(zhe)(zhe)樣線(xian)(xian)圈(quan)(quan)通電后在磁(ci)(ci)(ci)鐵的(de)作用下會(hui)旋(xuan)轉，這(zhe)(zhe)就是電流表(biao)、電壓表(biao)的(de)表(biao)頭部分。
這個(ge)(ge)表(biao)頭所(suo)(suo)能通(tong)過(guo)的(de)(de)電(dian)(dian)(dian)流(liu)很(hen)小，兩(liang)端所(suo)(suo)能承受(shou)的(de)(de)電(dian)(dian)(dian)壓(ya)也很(hen)小（肯定遠小于(yu)(yu)1V，可(ke)能只有(you)(you)零點零幾(ji)伏(fu)甚至更小），為了(le)(le)能測量實際電(dian)(dian)(dian)路中的(de)(de)電(dian)(dian)(dian)壓(ya)，需(xu)要給這個(ge)(ge)電(dian)(dian)(dian)壓(ya)表(biao)串聯(lian)一(yi)個(ge)(ge)比(bi)較(jiao)大(da)的(de)(de)電(dian)(dian)(dian)阻(zu)，做成(cheng)電(dian)(dian)(dian)壓(ya)表(biao)。這樣，即使兩(liang)端加(jia)上(shang)比(bi)較(jiao)大(da)的(de)(de)電(dian)(dian)(dian)壓(ya)，可(ke)是大(da)部分電(dian)(dian)(dian)壓(ya)都作(zuo)用(yong)(yong)在(zai)加(jia)的(de)(de)那個(ge)(ge)大(da)電(dian)(dian)(dian)阻(zu)上(shang)了(le)(le)，表(biao)頭上(shang)的(de)(de)電(dian)(dian)(dian)壓(ya)就(jiu)會(hui)很(hen)小了(le)(le)。電(dian)(dian)(dian)壓(ya)表(biao)是一(yi)種內部電(dian)(dian)(dian)阻(zu)很(hen)大(da)的(de)(de)儀器，一(yi)般應該(gai)大(da)于(yu)(yu)幾(ji)千歐(ou)。表(biao)頭是跟據通(tong)電(dian)(dian)(dian)導(dao)體在(zai)磁(ci)(ci)場(chang)中受(shou)磁(ci)(ci)場(chang)力(li)的(de)(de)作(zuo)用(yong)(yong)而(er)制成(cheng)的(de)(de)。表(biao)內部有(you)(you)一(yi)永(yong)磁(ci)(ci)體，在(zai)極間產生(sheng)磁(ci)(ci)場(chang)，在(zai)磁(ci)(ci)場(chang)中有(you)(you)一(yi)個(ge)(ge)線圈，線圈兩(liang)端各有(you)(you)一(yi)個(ge)(ge)游絲彈(dan)簧，彈(dan)簧各連(lian)接(jie)表(biao)的(de)(de)一(yi)個(ge)(ge)接(jie)線柱，在(zai)彈(dan)簧與線圈間由(you)一(yi)個(ge)(ge)轉(zhuan)(zhuan)軸(zhou)(zhou)連(lian)接(jie)，在(zai)轉(zhuan)(zhuan)軸(zhou)(zhou)相對于(yu)(yu)電(dian)(dian)(dian)流(liu)表(biao)的(de)(de)前端，有(you)(you)一(yi)個(ge)(ge)指(zhi)針(zhen)。當有(you)(you)電(dian)(dian)(dian)流(liu)通(tong)過(guo)時，電(dian)(dian)(dian)流(liu)沿彈(dan)簧、轉(zhuan)(zhuan)軸(zhou)(zhou)通(tong)過(guo)磁(ci)(ci)場(chang)，電(dian)(dian)(dian)流(liu)切磁(ci)(ci)感(gan)線，所(suo)(suo)以(yi)受(shou)磁(ci)(ci)場(chang)力(li)的(de)(de)作(zuo)用(yong)(yong)，使線圈發生(sheng)偏轉(zhuan)(zhuan)，帶(dai)動轉(zhuan)(zhuan)軸(zhou)(zhou)、指(zhi)針(zhen)偏轉(zhuan)(zhuan)。由(you)于(yu)(yu)磁(ci)(ci)場(chang)力(li)的(de)(de)大(da)小隨電(dian)(dian)(dian)流(liu)增大(da)而(er)增大(da)，所(suo)(suo)以(yi)就(jiu)可(ke)以(yi)通(tong)過(guo)指(zhi)針(zhen)的(de)(de)偏轉(zhuan)(zhuan)程度來觀察電(dian)(dian)(dian)流(liu)的(de)(de)大(da)小。
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