問題詳情
3. 如圖所示的直流電路，已知 R1 = R2 =R3 = R4 = 150 Ω ，而直流電源為ε = 6 V。當連結在電阻 R4 開關開啟後，則通過R1電阻的電流
(A)會增加為原來的 8/7 倍
(B) 不增不減
(C)會減少為原來的 7/8 倍
(D) 增加為原來的 9/8 倍
參考答案
無參考答案
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