基本電學 問題 - 考試
By Steve
at 2014-02-26T18:29
at 2014-02-26T18:29
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
題目:http://ppt.cc/eiMh
Vab=100∠0正向序;Z1=Z2=Z3=10∠60;求2瓦特表讀值。
想法:兩瓦特表的值應該分別是VL*VI*cos(30+θ)及VL*VI*cos(30-θ)。
VL=100, IL=10√3。問題就在θ要怎麼求呢?(我是算-90,因為負載
電流是-60,又線電流落後相電流30。但課本60)。
有高手能幫忙解感嗎?感恩!
--
題目:http://ppt.cc/eiMh
Vab=100∠0正向序;Z1=Z2=Z3=10∠60;求2瓦特表讀值。
想法:兩瓦特表的值應該分別是VL*VI*cos(30+θ)及VL*VI*cos(30-θ)。
VL=100, IL=10√3。問題就在θ要怎麼求呢?(我是算-90,因為負載
電流是-60,又線電流落後相電流30。但課本60)。
有高手能幫忙解感嗎?感恩!
--
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考試
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