基本電學 問題.. - 考試

By Selena
at 2013-02-21T16:19
at 2013-02-21T16:19
Table of Contents
設一電路之電壓,電流各為 v= 2 Vsinωt 伏特,i= 2 Icosωt 安培,則 V 與
I 之乘積表示
(A) 此電路之平均功率 (B) 此電路之虛功率 (C) 此電路之伏安(視在)功
率,但不等於虛功率 (D) 此電路之虛功率,但不等於伏安功率
這題答案給B
想問一下為什麼不會是C呢
謝謝
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