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1 如圖所示,變壓器二次側電壓為Vm,二極體是理想二極體,求VBA為?
A Vm
B 2Vs
C 3Vm
D 4Vm

C2可以充電到2Vm

C4可以充電到2Vm

VBA = 2Vm + 2Vm =4Vm