一、電壓表相當于一個什么
一般把可以測量電壓的電學儀器叫做電壓表,電壓表主要由永磁體、線圈等構成,在通電之后,線框在安培力的作用下帶動指針轉動。那么電壓表相當于一個什么呢(ni)?
電(dian)壓表相當于(yu)一個(ge)電(dian)阻,當加上電(dian)壓時就有電(dian)流(liu)(liu)(liu)通過(guo),電(dian)壓表也是利用測(ce)量(liang)通過(guo)的(de)電(dian)流(liu)(liu)(liu)來(lai)測(ce)量(liang)電(dian)壓的(de),只是電(dian)壓表的(de)電(dian)阻很大(相當于(yu)絕緣體),流(liu)(liu)(liu)過(guo)電(dian)壓表的(de)電(dian)流(liu)(liu)(liu)很小(xiao)。
電(dian)壓表是個相當(dang)大的(de)(de)電(dian)阻器(qi)(qi),理想的(de)(de)認為是斷路,在(zai)并聯電(dian)路中并聯了電(dian)壓表(跟(gen)別的(de)(de)用(yong)電(dian)器(qi)(qi)并聯)和用(yong)電(dian)器(qi)(qi),如果在(zai)干路中沒有(you)其他(ta)的(de)(de)用(yong)電(dian)器(qi)(qi),可以認為測量電(dian)源(yuan)電(dian)壓。
二、電壓表符號是什么
用個圓圈(quan)(quan)圈(quan)(quan)住一個V就是表示電(dian)壓表的符號(V是電(dian)壓的單位:伏特)。
電(dian)(dian)(dian)(dian)(dian)壓表(biao)(biao)(biao)是(shi)測量電(dian)(dian)(dian)(dian)(dian)壓的(de)(de)(de)(de)一種儀器,常用電(dian)(dian)(dian)(dian)(dian)壓表(biao)(biao)(biao)——伏特表(biao)(biao)(biao)符號(hao):V,在(zai)靈敏電(dian)(dian)(dian)(dian)(dian)流計里面有一個(ge)永磁(ci)體,在(zai)電(dian)(dian)(dian)(dian)(dian)流計的(de)(de)(de)(de)兩(liang)個(ge)接(jie)(jie)線(xian)(xian)柱(zhu)(zhu)之間串聯一個(ge)由導線(xian)(xian)構成的(de)(de)(de)(de)線(xian)(xian)圈,線(xian)(xian)圈放置(zhi)在(zai)永磁(ci)體的(de)(de)(de)(de)磁(ci)場中(zhong),并通過傳動裝置(zhi)與表(biao)(biao)(biao)的(de)(de)(de)(de)指針相(xiang)連。大部分電(dian)(dian)(dian)(dian)(dian)壓表(biao)(biao)(biao)都分為(wei)兩(liang)個(ge)量程。電(dian)(dian)(dian)(dian)(dian)壓表(biao)(biao)(biao)有三(san)個(ge)接(jie)(jie)線(xian)(xian)柱(zhu)(zhu),一個(ge)負(fu)接(jie)(jie)線(xian)(xian)柱(zhu)(zhu),兩(liang)個(ge)正接(jie)(jie)線(xian)(xian)柱(zhu)(zhu),電(dian)(dian)(dian)(dian)(dian)壓表(biao)(biao)(biao)的(de)(de)(de)(de)正極與電(dian)(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)正極連接(jie)(jie),負(fu)極與電(dian)(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)負(fu)極連接(jie)(jie)。