4.如【圖 4】所示，若 LED 順向電壓為 2 V，內阻為 100 Ω，則流過 LED 的電流為多少？(A)15 mA (B) 20 mA (C)25 mA (D)40 mA

問題詳情

4.如【圖 4】所示，若 LED 順向電壓為 2 V，內阻為 100 Ω，則流過 LED 的電流為多少？

(A)15 mA
(B) 20 mA
(C)25 mA
(D)40 mA

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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