基本電學-交流電平均值 - 考試

By Hedwig
at 2014-08-09T20:42
at 2014-08-09T20:42
Table of Contents
Q:i(t)=10+20sin(ωt+30°)+30sin(2ωt+60°)A,則i(t)的平均值為?
(A)10 (B)25.9 (C)38.16 (D)41.8
我的解法是,由於是算平均值,
正弦波訊號正半週與負半週的面積平均值為0
所以 i(t)的平均值是 (A) 10
但是解答是寫(B)25.9
懇請版大們解答,十分感謝。
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