基本電學 90四技 - 考試
By Dora
at 2013-03-26T20:52
at 2013-03-26T20:52
Table of Contents
將一理想直流電壓源與一可變電阻器並聯後,
再與一20Ω 之電阻器並聯;
當可變電阻器調整,
使可變電阻器之電阻值增加
(A)20Ω 電阻器上的電流與可變電阻器之電阻值成反比
(B)20Ω 電阻器上的電流不變
(C)20Ω 電阻器上的電流減少
(D)20Ω 電阻器上的電流增加。 【90 四技二專電機】
A:(B)
可以請教原因吗
直覺是以分流定則
可變電阻值變大 20歐姆的電阻器電流應該也會變大吧???
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