一、電壓表是不是內阻越大越好

電壓表內阻越(yue)大越(yue)好，主要(yao)原因有以下：

1、因為(wei)(wei)開(kai)(kai)路(lu)電壓測量(liang)要求測量(liang)儀器的(de)加入不影響信號的(de)原式狀(zhuang)態,如果電壓表(biao)內阻不夠大,就(jiu)會引(yin)起開(kai)(kai)路(lu)電壓發生(sheng)變化,造成測量(liang)結果的(de)不正確。所以盡量(liang)選擇內阻為(wei)(wei)無窮大的(de)電壓表(biao)測量(liang)。

2、電(dian)(dian)壓(ya)(ya)表的(de)內阻(zu)越(yue)大(da)越(yue)好(hao)，因為(wei)在(zai)測(ce)電(dian)(dian)壓(ya)(ya)時(shi)，電(dian)(dian)壓(ya)(ya)表是與被測(ce)部(bu)分并(bing)聯的(de)。當(dang)電(dian)(dian)壓(ya)(ya)表的(de)內阻(zu)越(yue)大(da)時(shi)，則并(bing)聯后的(de)總電(dian)(dian)阻(zu)與被測(ce)體的(de)本身的(de)電(dian)(dian)阻(zu)越(yue)接(jie)近，則回路(lu)電(dian)(dian)流(liu)越(yue)接(jie)近真實值，或者(zhe)說(shuo)電(dian)(dian)壓(ya)(ya)表分流(liu)越(yue)小越(yue)準確，測(ce)的(de)結果也就(jiu)越(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)壓表(biao)可以用來測量電(dian)壓，當電(dian)壓表(biao)并聯在(zai)電(dian)路(lu)(lu)當中時，會被這個串(chuan)聯的電(dian)阻(zu)所分擔。那么，接下(xia)來為大(da)家(jia)介紹電(dian)壓表(biao)串(chuan)聯在(zai)電(dian)路(lu)(lu)中會怎(zen)么樣。

會出(chu)(chu)現斷路現象，數值(zhi)會出(chu)(chu)現0。在(zai)使用電(dian)壓(ya)表時，要(yao)先根(gen)據測(ce)量(liang)大小選擇(ze)合適的量(liang)程，然后進行接線，要(yao)是電(dian)壓(ya)表接錯，出(chu)(chu)現串聯，那會因內阻太大，使得(de)測(ce)量(liang)電(dian)路出(chu)(chu)現開路狀態，這樣電(dian)壓(ya)表就(jiu)沒辦(ban)法(fa)正常工作。

三、電壓表怎么看測哪個的電壓

1、去源法

所謂(wei)的去源法(fa)，簡單(dan)說法(fa)就是(shi)用手捂住(zhu)電(dian)(dian)(dian)(dian)源，主要(yao)看電(dian)(dian)(dian)(dian)壓表(biao)與哪部分(fen)構成(cheng)閉合(he)回(hui)路，就可以清(qing)晰看出電(dian)(dian)(dian)(dian)壓表(biao)測的是(shi)哪部分(fen)電(dian)(dian)(dian)(dian)路的電(dian)(dian)(dian)(dian)壓了。

2、滑線法

電(dian)壓表(biao)(biao)的(de)兩端沿著連接的(de)導線滑(hua)動到耗電(dian)元件(jian)或電(dian)源的(de)兩端（可以(yi)跨(kua)越組件(jian)：開(kai)關、電(dian)流表(biao)(biao)）。不要交叉組件(jian)：電(dian)源、電(dian)器(qi)、電(dian)壓表(biao)(biao)。）滑(hua)動以(yi)查看電(dian)壓表(biao)(biao)測得(de)的(de)電(dian)壓是否(fou)為(wei)電(dian)源電(dian)壓。

3、短路法

假設(she)導線連接(jie)到(dao)此(ci)位置(zhi)，則電壓表被拆(chai)下。如果(guo)此(ci)時某些耗電元件或電源(yuan)短(duan)路，則這些耗電元件或電源(yuan)是電壓表的測(ce)量對(dui)象(xiang)。

四、電壓表的工作原理是什么

傳統的指(zhi)(zhi)針式電(dian)壓(ya)(ya)表(biao)和電(dian)流(liu)表(biao)都(dou)是根據(ju)一個(ge)原(yuan)理就是電(dian)流(liu)的磁(ci)(ci)效應。電(dian)流(liu)越大，所產生(sheng)的磁(ci)(ci)力(li)越大，表(biao)現出的就是電(dian)壓(ya)(ya)表(biao)上的指(zhi)(zhi)針的擺(bai)幅(fu)越大，電(dian)壓(ya)(ya)表(biao)內有一個(ge)磁(ci)(ci)鐵和一個(ge)導線(xian)線(xian)圈(quan)(quan)，通過(guo)電(dian)流(liu)后，會使線(xian)圈(quan)(quan)產生(sheng)磁(ci)(ci)場(chang)，線(xian)圈(quan)(quan)通電(dian)后在磁(ci)(ci)鐵的作(zuo)用下會發生(sheng)偏轉，這(zhe)就是電(dian)流(liu)表(biao)、電(dian)壓(ya)(ya)表(biao)的表(biao)頭(tou)部分。

由于電(dian)(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)(biao)要與被(bei)測電(dian)(dian)(dian)(dian)(dian)阻并聯(lian)，所(suo)以(yi)如果直接(jie)用靈敏電(dian)(dian)(dian)(dian)(dian)流(liu)計當(dang)電(dian)(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)(biao)用，表(biao)(biao)(biao)中(zhong)的(de)電(dian)(dian)(dian)(dian)(dian)流(liu)過大(da)(da)，會燒壞電(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)，這(zhe)時需要在電(dian)(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)(biao)的(de)內部(bu)電(dian)(dian)(dian)(dian)(dian)路中(zhong)串聯(lian)一個很大(da)(da)的(de)電(dian)(dian)(dian)(dian)(dian)阻，這(zhe)樣改造后(hou)，當(dang)電(dian)(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)(biao)再并聯(lian)在電(dian)(dian)(dian)(dian)(dian)路中(zhong)時，由于電(dian)(dian)(dian)(dian)(dian)阻的(de)作用，加在電(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)兩端的(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)絕(jue)大(da)(da)部(bu)分都被(bei)這(zhe)個串聯(lian)的(de)電(dian)(dian)(dian)(dian)(dian)阻分擔(dan)了(le)，所(suo)以(yi)通過電(dian)(dian)(dian)(dian)(dian)表(biao)(biao)(biao)的(de)電(dian)(dian)(dian)(dian)(dian)流(liu)實際(ji)上(shang)很小，所(suo)以(yi)就(jiu)可以(yi)正(zheng)常使(shi)用了(le)。