基本電學p(t)功率函數的觀念問題 - 考試

By Enid
at 2017-01-29T13:57
at 2017-01-29T13:57
Table of Contents
例題是 v(t)=50sin(3t) ,負載為8歐姆電阻串接6歐姆電感。
請問p(t)=?
答案很理所當然地寫
p(t)=v(t)*i(t)= 50sin(3t) * 5sin(3t-37度)
我想問的是.. 這不是S(t)嗎? 我以為p(t)的算法應該要再乘cos 如下才對
p(t)=v(t)*i(t)= 50sin(3t) * 5sin(3t-37度) * cos(37度)
但是如果
p(t)=v(t)*i(t)= 50sin(3t) * 5sin(3t-37度) 是對的
那請問 S(t)=?
以上,謝謝
--
請問p(t)=?
答案很理所當然地寫
p(t)=v(t)*i(t)= 50sin(3t) * 5sin(3t-37度)
我想問的是.. 這不是S(t)嗎? 我以為p(t)的算法應該要再乘cos 如下才對
p(t)=v(t)*i(t)= 50sin(3t) * 5sin(3t-37度) * cos(37度)
但是如果
p(t)=v(t)*i(t)= 50sin(3t) * 5sin(3t-37度) 是對的
那請問 S(t)=?
以上,謝謝
--
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