99年佐級基本電學大意第30題 - 考試
By Mason
at 2018-11-20T17:22
at 2018-11-20T17:22
Table of Contents
https://i.imgur.com/00MChhQ.jpg
(C)0.8、滯後
(D)0.8、超前
答案:
(C)
想法:
功率因素PF = VR/V,分母的V應該是總電壓吧?可是
題目又沒給v(t),難道會是80+100+40嗎?這樣算出
來也不對啊?還是我的觀念有誤?請前輩指點,謝謝。
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考試
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