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6 跨接於電阻器之電壓增加一倍時,則此電阻器消耗的功率變為原來的多少倍?(A)4 (B)2 (C) 0.5 (D)1
問題詳情
6 跨接於電阻器之電壓增加一倍時,則此電阻器消耗的功率變為原來的多少倍?
(A)4
(B)2
(C) 0.5
(D)1
參考答案
答案:A
難度:簡單0.883929
統計:A(99),B(7),C(0),D(1),E(0)
用户評論
【
lexmvrk
】評論
不懂這一題如何算
【
吳巽哲
】評論
假設R=2 , V=4P=V2/RP=42/2P=8 電壓增加一倍後 V=8P=82/2P=32前後相比32/8=4 , 所以答案為四倍
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