一、電壓表是不是內阻越大越好

電壓表內阻越大越好，主要(yao)原因有(you)以(yi)下(xia)：

1、因為開路(lu)電壓測(ce)量要求測(ce)量儀(yi)器的加入(ru)不影響信號的原式狀態,如果(guo)電壓表內阻(zu)不夠大,就會引起(qi)開路(lu)電壓發(fa)生(sheng)變化,造成(cheng)測(ce)量結(jie)果(guo)的不正確(que)。所以盡(jin)量選擇內阻(zu)為無窮(qiong)大的電壓表測(ce)量。

2、電(dian)壓(ya)表(biao)的(de)(de)內阻越(yue)大(da)越(yue)好(hao)，因為(wei)在測電(dian)壓(ya)時，電(dian)壓(ya)表(biao)是與被(bei)(bei)測部分(fen)并聯的(de)(de)。當電(dian)壓(ya)表(biao)的(de)(de)內阻越(yue)大(da)時，則并聯后的(de)(de)總電(dian)阻與被(bei)(bei)測體的(de)(de)本身的(de)(de)電(dian)阻越(yue)接近，則回路(lu)電(dian)流(liu)越(yue)接近真(zhen)實值，或(huo)者說電(dian)壓(ya)表(biao)分(fen)流(liu)越(yue)小越(yue)準確，測的(de)(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)(dian)(dian)壓(ya)(ya)表可(ke)以用(yong)來(lai)測(ce)量電(dian)(dian)(dian)壓(ya)(ya)，當電(dian)(dian)(dian)壓(ya)(ya)表并聯在(zai)電(dian)(dian)(dian)路當中時，會(hui)被這個串聯的電(dian)(dian)(dian)阻所分擔。那(nei)么，接(jie)下來(lai)為大家介(jie)紹電(dian)(dian)(dian)壓(ya)(ya)表串聯在(zai)電(dian)(dian)(dian)路中會(hui)怎么樣。

會出(chu)現(xian)斷路(lu)現(xian)象，數值會出(chu)現(xian)0。在使用電(dian)壓表(biao)時，要(yao)先根據測(ce)量大(da)小選擇(ze)合適的量程，然后進行(xing)接(jie)線，要(yao)是(shi)電(dian)壓表(biao)接(jie)錯，出(chu)現(xian)串(chuan)聯，那會因內(nei)阻太(tai)大(da)，使得(de)測(ce)量電(dian)路(lu)出(chu)現(xian)開(kai)路(lu)狀態，這(zhe)樣電(dian)壓表(biao)就沒辦法正常工作(zuo)。

三、電壓表怎么看測哪個的電壓

1、去源法

所(suo)謂(wei)的(de)去(qu)源(yuan)法，簡單說(shuo)法就是(shi)用手捂住電(dian)源(yuan)，主要看電(dian)壓(ya)表與哪部分構成閉合回路，就可以清晰看出電(dian)壓(ya)表測的(de)是(shi)哪部分電(dian)路的(de)電(dian)壓(ya)了。

2、滑線法

電(dian)(dian)(dian)壓(ya)(ya)表的(de)(de)兩(liang)端沿(yan)著連接的(de)(de)導線滑動到(dao)耗電(dian)(dian)(dian)元件(jian)(jian)或電(dian)(dian)(dian)源的(de)(de)兩(liang)端（可(ke)以跨越(yue)組件(jian)(jian)：開(kai)關(guan)、電(dian)(dian)(dian)流表）。不要交叉組件(jian)(jian)：電(dian)(dian)(dian)源、電(dian)(dian)(dian)器、電(dian)(dian)(dian)壓(ya)(ya)表。）滑動以查看電(dian)(dian)(dian)壓(ya)(ya)表測(ce)得(de)的(de)(de)電(dian)(dian)(dian)壓(ya)(ya)是否為電(dian)(dian)(dian)源電(dian)(dian)(dian)壓(ya)(ya)。

3、短路法

假設導(dao)線連接(jie)到此位置(zhi)，則電(dian)壓表(biao)被拆下。如果此時某些耗(hao)(hao)電(dian)元(yuan)件或(huo)(huo)電(dian)源(yuan)短路，則這些耗(hao)(hao)電(dian)元(yuan)件或(huo)(huo)電(dian)源(yuan)是電(dian)壓表(biao)的測(ce)量對(dui)象。

四、電壓表的工作原理是什么

傳統的(de)指針式電(dian)(dian)(dian)壓表(biao)和電(dian)(dian)(dian)流(liu)表(biao)都是根據(ju)一個原理就是電(dian)(dian)(dian)流(liu)的(de)磁效應。電(dian)(dian)(dian)流(liu)越大，所產生(sheng)(sheng)的(de)磁力越大，表(biao)現出的(de)就是電(dian)(dian)(dian)壓表(biao)上的(de)指針的(de)擺幅越大，電(dian)(dian)(dian)壓表(biao)內有一個磁鐵(tie)和一個導線線圈(quan)，通過電(dian)(dian)(dian)流(liu)后(hou)，會使(shi)線圈(quan)產生(sheng)(sheng)磁場，線圈(quan)通電(dian)(dian)(dian)后(hou)在磁鐵(tie)的(de)作用下會發生(sheng)(sheng)偏轉，這(zhe)就是電(dian)(dian)(dian)流(liu)表(biao)、電(dian)(dian)(dian)壓表(biao)的(de)表(biao)頭部分。

由于電(dian)(dian)壓(ya)表(biao)(biao)(biao)要(yao)與被測電(dian)(dian)阻并聯，所(suo)以如果直(zhi)接用(yong)靈敏(min)電(dian)(dian)流計當電(dian)(dian)壓(ya)表(biao)(biao)(biao)用(yong)，表(biao)(biao)(biao)中的電(dian)(dian)流過大，會(hui)燒壞電(dian)(dian)表(biao)(biao)(biao)，這時(shi)需要(yao)在(zai)電(dian)(dian)壓(ya)表(biao)(biao)(biao)的內部電(dian)(dian)路(lu)中串聯一個(ge)很大的電(dian)(dian)阻，這樣改造后，當電(dian)(dian)壓(ya)表(biao)(biao)(biao)再并聯在(zai)電(dian)(dian)路(lu)中時(shi)，由于電(dian)(dian)阻的作用(yong)，加在(zai)電(dian)(dian)表(biao)(biao)(biao)兩(liang)端的電(dian)(dian)壓(ya)絕(jue)大部分都被這個(ge)串聯的電(dian)(dian)阻分擔了，所(suo)以通過電(dian)(dian)表(biao)(biao)(biao)的電(dian)(dian)流實際上很小，所(suo)以就可以正常使(shi)用(yong)了。