如圖所示,D1及D2之PIV值皆為()
A.Vm B.2Vm C.3Vm D.4Vm
如圖所示為整流后波形;其Vdc=25V,Vr(P-P)=2.828V,則其漣波百分率為()
A.4% B.5% C.10% D.15%
A.0.5% B.1% C.2.5% D.5%