220v交流電壓最大值是多少
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來源:金環宇電線發布日(ri)期:2019-10-11 10:03
交流電壓的定義
交(jiao)(jiao)流(liu)電(dian)(dian)是指大小和(he)方(fang)向都發(fa)生(sheng)周期性(xing)變(bian)化(hua)電(dian)(dian)壓。通常(chang)為正(zheng)弦交(jiao)(jiao)流(liu)電(dian)(dian),但實際(ji)中也存(cun)在方(fang)波(bo)交(jiao)(jiao)流(liu)電(dian)(dian)、三角形波(bo)交(jiao)(jiao)流(liu)電(dian)(dian)等。
220v交流電壓最大值
一般(ban)形(xing)容(rong)交(jiao)流(liu)電(dian)電(dian)壓時(shi),除(chu)非有(you)說(shuo)明,否(fou)則(ze)默認指的(de)(de)都是(shi)有(you)效值(zhi)。家用220V電(dian)力也是(shi)一樣,220V指的(de)(de)是(shi)有(you)效值(zhi)。正弦交(jiao)流(liu)電(dian)的(de)(de)有(you)效值(zhi)乘(cheng)以根號(hao)下2就可(ke)以得出最大值(zhi)。220V×根號(hao)下2=311.13V。
交流(liu)(liu)電(dian)(dian)(dian)被廣(guang)泛運用于(yu)電(dian)(dian)(dian)力的(de)(de)(de)傳輸,因為在以(yi)往的(de)(de)(de)技術(shu)條件下交流(liu)(liu)輸電(dian)(dian)(dian)比直流(liu)(liu)輸電(dian)(dian)(dian)更(geng)有效率。傳輸的(de)(de)(de)電(dian)(dian)(dian)流(liu)(liu)在導線(xian)上的(de)(de)(de)耗散功率可用焦耳定(ding)律(lv)(P =I ²R)求得,顯(xian)然要降(jiang)低(di)(di)能量損耗需要降(jiang)低(di)(di)傳輸的(de)(de)(de)電(dian)(dian)(dian)流(liu)(liu)或(huo)電(dian)(dian)(dian)線(xian)的(de)(de)(de)電(dian)(dian)(dian)阻。由于(yu)成(cheng)本(ben)和技術(shu)所(suo)限(xian),很難降(jiang)低(di)(di)目前(qian)使用的(de)(de)(de)輸電(dian)(dian)(dian)線(xian)路(如銅線(xian))的(de)(de)(de)電(dian)(dian)(dian)阻,所(suo)以(yi)降(jiang)低(di)(di)傳輸的(de)(de)(de)電(dian)(dian)(dian)流(liu)(liu)是唯一而且有效的(de)(de)(de)方法。