問題詳情
23. 圖(四)是電晶體 Q 驅動發光二極體 (LED) 的電路，若此電晶體當開關使用，輸入的電壓Vi 為5 V，則 LED 亮時，輸出電壓 V0的近似值為多少？ 
(A) 0 V
(B) 5 V
(C) 7.5 V
(D) 15 V
(A) 0 V
(B) 5 V
(C) 7.5 V
(D) 15 V
參考答案
答案：A
難度：非常困難0
統計：A(0),B(0),C(2),D(0),E(0)
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