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50. 交流電路中,平均功率是指一個交流週期中瞬間功率的平均值,若將100V、60Hz之正弦交流電壓加於50Ω的純電阻兩端,則下列敘述何者正確?(A)瞬間功率之頻率為60Hz(B)瞬間功率最大值為40
問題詳情
50. 交流電路中,平均功率是指一個交流週期中瞬間功率的平均值,若將100V、60Hz之正弦交流電壓加於50Ω的純電阻兩端,則下列敘述何者正確?
(A)瞬間功率之頻率為60Hz
(B)瞬間功率最大值為400W
(C)瞬間功率最小值為0
(D)平均功率為100W
參考答案
答案:B,C
難度:
困難
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49. 改善功率因數之效益,下列敘述何者正確?(A)增加線路電流(B)增加系統供應容量(C)減少線路電力損失(D)增加線路電力損失
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