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20當功率因數為 1 時,則電壓與電流之相位差為下列何者?(A)0 度 (B)30 度 (C)60 度 (D)90 度
問題詳情
20當功率因數為 1 時,則電壓與電流之相位差為下列何者?
(A)0 度
(B)30 度
(C)60 度
(D)90 度
參考答案
答案:A
難度:
計算中
-1
書單:
沒有書單,新增
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19重疊定理不適用於下列何者之計算?(A)電壓 (B)電流 (C)功率 (D)電阻
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21一交流發電機,轉速 360rpm,產生電動勢的頻率為 60 赫,則其磁極為下列何者?(A)10 個 (B)20 個 (C)30 個 (D)40 個
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