描述
交流電壓：交流電壓在我們的物理書中的官方介紹是電壓的大小和方向都隨時間的改變而改變的電叫做交流電壓。我們常見的交流電壓有我們常用的家庭民用220V電壓和工業(yè)用380V的交流電等等，因為交流電隨著時間的變化而變化，所以有時電壓很高有時電壓卻很低，是不穩(wěn)定的，所以交流電壓是有平均值和峰值的，而我們所說的220V和380V等都是交流電壓的平均值，交流電壓的平均值是取自其峰值電壓的0.707倍。
兩者區(qū)別：直流電壓和交流電壓的區(qū)別之一很明顯的在于二者的大小和方向與時間的關(guān)系是不同的，直流電壓是均不改變，但是交流電壓是均會改變的;區(qū)別之二在于直流電壓因為其電壓的方向始終是不會改變的，所以會有正極和負極之分，但是交流電壓因其時刻會改變，所以就沒有正負極之分，但是在這里我們要注意直流電壓也不是一成不變的，像是二極管整流之后末濾波穩(wěn)壓之前，還是會有變動的，這種稱為脈動直流電;區(qū)別之三在于直流電壓是經(jīng)過變電轉(zhuǎn)換的而交流電壓是沒有經(jīng)過變電轉(zhuǎn)換的。
我們在生活中區(qū)別直流電壓和交流電壓可以使用交流電壓檔測量電壓，然后再將表筆調(diào)換一下位置之后在測量一次電壓，如果兩次的測量結(jié)果相同，那么就可以判定是交流電壓，如果兩次測量的結(jié)果一次是有讀數(shù)的，但是另一次沒有讀數(shù)的，那么我們就可以判定出是直流電壓啦!不管是直流電壓還是交流電壓在我們的生活中都是很重要的!
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