問題詳情
7 消耗 100 瓦的電燈泡在使用時，流過的電流為 0.9 安培，則當時的電源電壓為多少伏特？（以最接近之數值為準）
(A) 120
(B) 111
(C) 100
(D) 90
(A) 120
(B) 111
(C) 100
(D) 90
參考答案
答案：B
難度：非常簡單0.944099
統計：A(4),B(152),C(2),D(3),E(0)
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