一、電壓表是不是內阻越大越好

電壓表內(nei)阻越大越好(hao)，主要原因有以(yi)下：

1、因(yin)為開路(lu)電壓(ya)測(ce)(ce)量(liang)要求測(ce)(ce)量(liang)儀(yi)器的加入不(bu)影響信(xin)號的原(yuan)式(shi)狀態(tai),如果(guo)電壓(ya)表內阻不(bu)夠大,就會引起開路(lu)電壓(ya)發(fa)生變化(hua),造成測(ce)(ce)量(liang)結果(guo)的不(bu)正確(que)。所(suo)以(yi)盡量(liang)選擇(ze)內阻為無窮大的電壓(ya)表測(ce)(ce)量(liang)。

2、電(dian)(dian)(dian)壓(ya)(ya)表的內阻(zu)(zu)越(yue)(yue)大(da)越(yue)(yue)好，因(yin)為(wei)在(zai)測(ce)電(dian)(dian)(dian)壓(ya)(ya)時，電(dian)(dian)(dian)壓(ya)(ya)表是與被測(ce)部(bu)分并(bing)聯的。當電(dian)(dian)(dian)壓(ya)(ya)表的內阻(zu)(zu)越(yue)(yue)大(da)時，則(ze)并(bing)聯后的總電(dian)(dian)(dian)阻(zu)(zu)與被測(ce)體的本身的電(dian)(dian)(dian)阻(zu)(zu)越(yue)(yue)接近(jin)，則(ze)回路電(dian)(dian)(dian)流越(yue)(yue)接近(jin)真實(shi)值，或者說(shuo)電(dian)(dian)(dian)壓(ya)(ya)表分流越(yue)(yue)小越(yue)(yue)準(zhun)確(que)，測(ce)的結(jie)果也就越(yue)(yue)準(zhun)確(que)。

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

電壓(ya)表可以(yi)用來測量電壓(ya)，當電壓(ya)表并聯在電路(lu)當中時(shi)，會被這個串聯的電阻所分擔。那么，接下來為(wei)大家介紹電壓(ya)表串聯在電路(lu)中會怎么樣。

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，要先根據測(ce)(ce)量(liang)大小選擇合適(shi)的量(liang)程，然后進行接線，要是電(dian)壓(ya)表(biao)接錯，出現(xian)串聯，那會因內阻(zu)太大，使得(de)測(ce)(ce)量(liang)電(dian)路(lu)出現(xian)開(kai)路(lu)狀態，這樣(yang)電(dian)壓(ya)表(biao)就(jiu)沒辦法正常工作。

三、電壓表怎么看測哪個的電壓

1、去源法

所謂(wei)的(de)去源法，簡單說法就是(shi)用手(shou)捂(wu)住電(dian)源，主要看電(dian)壓(ya)表與哪(na)(na)部分構成(cheng)閉合回路，就可(ke)以清晰看出電(dian)壓(ya)表測的(de)是(shi)哪(na)(na)部分電(dian)路的(de)電(dian)壓(ya)了。

2、滑線法

電(dian)壓表的兩端(duan)沿著連接的導線滑動到耗(hao)電(dian)元(yuan)件或電(dian)源的兩端(duan)（可(ke)以(yi)跨(kua)越(yue)組件：開關、電(dian)流(liu)表）。不(bu)要交(jiao)叉(cha)組件：電(dian)源、電(dian)器、電(dian)壓表。）滑動以(yi)查(cha)看電(dian)壓表測得的電(dian)壓是否為電(dian)源電(dian)壓。

3、短路法

假設(she)導線連接(jie)到此位置，則電(dian)壓表被(bei)拆下(xia)。如果此時某些耗電(dian)元(yuan)件(jian)或電(dian)源(yuan)短路，則這些耗電(dian)元(yuan)件(jian)或電(dian)源(yuan)是電(dian)壓表的測(ce)量對象。

四、電壓表的工作原理是什么

傳(chuan)統(tong)的(de)(de)指(zhi)針(zhen)式電(dian)(dian)(dian)(dian)壓表(biao)和電(dian)(dian)(dian)(dian)流(liu)表(biao)都是(shi)根據(ju)一(yi)個原(yuan)理(li)就是(shi)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)磁(ci)效(xiao)應。電(dian)(dian)(dian)(dian)流(liu)越大(da)，所(suo)產生的(de)(de)磁(ci)力越大(da)，表(biao)現出的(de)(de)就是(shi)電(dian)(dian)(dian)(dian)壓表(biao)上的(de)(de)指(zhi)針(zhen)的(de)(de)擺幅越大(da)，電(dian)(dian)(dian)(dian)壓表(biao)內有一(yi)個磁(ci)鐵和一(yi)個導線(xian)線(xian)圈，通(tong)(tong)過電(dian)(dian)(dian)(dian)流(liu)后，會使線(xian)圈產生磁(ci)場，線(xian)圈通(tong)(tong)電(dian)(dian)(dian)(dian)后在磁(ci)鐵的(de)(de)作用下會發(fa)生偏轉，這就是(shi)電(dian)(dian)(dian)(dian)流(liu)表(biao)、電(dian)(dian)(dian)(dian)壓表(biao)的(de)(de)表(biao)頭部分。

由于(yu)電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)要與被測電(dian)(dian)(dian)(dian)阻(zu)并(bing)聯(lian)(lian)，所以(yi)如(ru)果直(zhi)接用(yong)靈(ling)敏(min)電(dian)(dian)(dian)(dian)流(liu)計當電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)用(yong)，表(biao)(biao)中(zhong)(zhong)的(de)電(dian)(dian)(dian)(dian)流(liu)過大(da)，會燒壞電(dian)(dian)(dian)(dian)表(biao)(biao)，這(zhe)時需要在電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)的(de)內(nei)部(bu)電(dian)(dian)(dian)(dian)路中(zhong)(zhong)串聯(lian)(lian)一個(ge)(ge)很大(da)的(de)電(dian)(dian)(dian)(dian)阻(zu)，這(zhe)樣(yang)改造(zao)后(hou)，當電(dian)(dian)(dian)(dian)壓(ya)表(biao)(biao)再并(bing)聯(lian)(lian)在電(dian)(dian)(dian)(dian)路中(zhong)(zhong)時，由于(yu)電(dian)(dian)(dian)(dian)阻(zu)的(de)作(zuo)用(yong)，加在電(dian)(dian)(dian)(dian)表(biao)(biao)兩端的(de)電(dian)(dian)(dian)(dian)壓(ya)絕大(da)部(bu)分都被這(zhe)個(ge)(ge)串聯(lian)(lian)的(de)電(dian)(dian)(dian)(dian)阻(zu)分擔了(le)，所以(yi)通(tong)過電(dian)(dian)(dian)(dian)表(biao)(biao)的(de)電(dian)(dian)(dian)(dian)流(liu)實際上很小，所以(yi)就可(ke)以(yi)正(zheng)常(chang)使用(yong)了(le)。