一、電壓表是不是內阻越大越好

電壓(ya)表內阻越大越好，主要原(yuan)因有(you)以下：

1、因為開路電壓(ya)測量(liang)要求(qiu)測量(liang)儀器的加入不影響信號的原式狀態(tai),如果(guo)電壓(ya)表內阻不夠大,就會引起開路電壓(ya)發生變化,造成測量(liang)結果(guo)的不正確。所以盡量(liang)選(xuan)擇內阻為無窮大的電壓(ya)表測量(liang)。

2、電(dian)(dian)(dian)壓(ya)(ya)表(biao)的(de)內(nei)阻(zu)越(yue)(yue)大(da)越(yue)(yue)好，因為在測(ce)電(dian)(dian)(dian)壓(ya)(ya)時，電(dian)(dian)(dian)壓(ya)(ya)表(biao)是與被測(ce)部(bu)分并聯的(de)。當電(dian)(dian)(dian)壓(ya)(ya)表(biao)的(de)內(nei)阻(zu)越(yue)(yue)大(da)時，則并聯后的(de)總電(dian)(dian)(dian)阻(zu)與被測(ce)體的(de)本身的(de)電(dian)(dian)(dian)阻(zu)越(yue)(yue)接近，則回路電(dian)(dian)(dian)流(liu)越(yue)(yue)接近真實(shi)值，或者(zhe)說電(dian)(dian)(dian)壓(ya)(ya)表(biao)分流(liu)越(yue)(yue)小(xiao)越(yue)(yue)準確，測(ce)的(de)結果也就越(yue)(yue)準確。

可以到電壓表十大品牌了解更多信息哦。

二、電壓表串聯在電路中會怎么樣

電(dian)(dian)壓(ya)(ya)表可以用來測(ce)量電(dian)(dian)壓(ya)(ya)，當電(dian)(dian)壓(ya)(ya)表并聯在電(dian)(dian)路當中(zhong)時(shi)，會(hui)被(bei)這個串聯的電(dian)(dian)阻(zu)所(suo)分擔(dan)。那(nei)么(me)，接下(xia)來為大家(jia)介紹電(dian)(dian)壓(ya)(ya)表串聯在電(dian)(dian)路中(zhong)會(hui)怎么(me)樣。

會出現(xian)斷路(lu)現(xian)象(xiang)，數值會出現(xian)0。在使用電(dian)壓(ya)表(biao)時，要(yao)先根(gen)據測(ce)量(liang)大小選擇合(he)適(shi)的量(liang)程，然后進行(xing)接線，要(yao)是電(dian)壓(ya)表(biao)接錯，出現(xian)串聯，那會因(yin)內(nei)阻太大，使得測(ce)量(liang)電(dian)路(lu)出現(xian)開路(lu)狀態，這樣電(dian)壓(ya)表(biao)就沒辦(ban)法正常工作。

三、電壓表怎么看測哪個的電壓

1、去源法

所謂(wei)的去源(yuan)(yuan)法，簡(jian)單說法就是(shi)用(yong)手捂住電(dian)源(yuan)(yuan)，主要看(kan)電(dian)壓(ya)(ya)表與哪部(bu)分構成閉合回路，就可(ke)以清晰看(kan)出電(dian)壓(ya)(ya)表測的是(shi)哪部(bu)分電(dian)路的電(dian)壓(ya)(ya)了。

2、滑線法

電(dian)壓(ya)(ya)表(biao)的(de)兩(liang)端(duan)沿著連接的(de)導線滑動到耗電(dian)元件或電(dian)源的(de)兩(liang)端(duan)（可以(yi)跨(kua)越(yue)組(zu)件：開關、電(dian)流表(biao)）。不要交叉(cha)組(zu)件：電(dian)源、電(dian)器、電(dian)壓(ya)(ya)表(biao)。）滑動以(yi)查看電(dian)壓(ya)(ya)表(biao)測得的(de)電(dian)壓(ya)(ya)是否為電(dian)源電(dian)壓(ya)(ya)。

3、短路法

假設導線連接(jie)到此(ci)位置，則電(dian)(dian)(dian)壓(ya)表被拆下。如(ru)果此(ci)時某些耗(hao)電(dian)(dian)(dian)元件或(huo)電(dian)(dian)(dian)源短路，則這些耗(hao)電(dian)(dian)(dian)元件或(huo)電(dian)(dian)(dian)源是電(dian)(dian)(dian)壓(ya)表的測量對象。

四、電壓表的工作原理是什么

傳統的(de)(de)指針(zhen)式電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)表(biao)(biao)(biao)(biao)和(he)(he)電(dian)(dian)(dian)(dian)流(liu)(liu)表(biao)(biao)(biao)(biao)都是(shi)根據一個(ge)原理就(jiu)是(shi)電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)磁效應(ying)。電(dian)(dian)(dian)(dian)流(liu)(liu)越(yue)(yue)大，所產生的(de)(de)磁力越(yue)(yue)大，表(biao)(biao)(biao)(biao)現(xian)出的(de)(de)就(jiu)是(shi)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)表(biao)(biao)(biao)(biao)上的(de)(de)指針(zhen)的(de)(de)擺幅越(yue)(yue)大，電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)表(biao)(biao)(biao)(biao)內(nei)有一個(ge)磁鐵和(he)(he)一個(ge)導(dao)線(xian)線(xian)圈(quan)，通過電(dian)(dian)(dian)(dian)流(liu)(liu)后(hou)，會使線(xian)圈(quan)產生磁場，線(xian)圈(quan)通電(dian)(dian)(dian)(dian)后(hou)在磁鐵的(de)(de)作用下會發(fa)生偏(pian)轉，這就(jiu)是(shi)電(dian)(dian)(dian)(dian)流(liu)(liu)表(biao)(biao)(biao)(biao)、電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)表(biao)(biao)(biao)(biao)的(de)(de)表(biao)(biao)(biao)(biao)頭(tou)部分。

由于電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)要與被(bei)測電(dian)(dian)(dian)(dian)阻(zu)并(bing)聯，所(suo)(suo)以如果直接用靈敏電(dian)(dian)(dian)(dian)流(liu)(liu)計(ji)當(dang)電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)用，表(biao)(biao)中(zhong)的電(dian)(dian)(dian)(dian)流(liu)(liu)過(guo)(guo)大，會燒(shao)壞電(dian)(dian)(dian)(dian)表(biao)(biao)，這(zhe)時需要在電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)的內部電(dian)(dian)(dian)(dian)路(lu)(lu)中(zhong)串聯一個(ge)很大的電(dian)(dian)(dian)(dian)阻(zu)，這(zhe)樣改造后，當(dang)電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)再并(bing)聯在電(dian)(dian)(dian)(dian)路(lu)(lu)中(zhong)時，由于電(dian)(dian)(dian)(dian)阻(zu)的作用，加在電(dian)(dian)(dian)(dian)表(biao)(biao)兩端的電(dian)(dian)(dian)(dian)壓(ya)絕大部分(fen)都被(bei)這(zhe)個(ge)串聯的電(dian)(dian)(dian)(dian)阻(zu)分(fen)擔了，所(suo)(suo)以通過(guo)(guo)電(dian)(dian)(dian)(dian)表(biao)(biao)的電(dian)(dian)(dian)(dian)流(liu)(liu)實際(ji)上(shang)很小，所(suo)(suo)以就可以正常使(shi)用了。