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範例:二極體整流與變壓器[94指考]

如圖所示的電路中,交流電源的最大電壓為12.0 V,理想變壓器的原線圈與副線圈的匝數比為21,二極體可視為理想的整流器:順向偏壓時,二極體形同短路;逆向偏壓時,二極體形同斷路,電阻R = 5.0 Ω。電阻R 兩端的電位差(或稱電壓) VAB定義為VAB= VAVBVA VB 分別為A點和B點的電位。試問下列敘述中,哪些正確?(A)VAB的最大值為4.0V(B)VAB 的最小值為0 V (C)流經電阻R 的電流為直流 (D)流經電阻R 的平均電流為零 (E)流經電阻R的最大電流值為0.8A[94指考]
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Posted in 歷屆物理考題, 現代科技簡介.

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