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The efficiency(n) of fullwave rectifier is defined as: n=DC output Power/AC input power But Power=V*I n=Vdc*Idc/Vrms*Irms But Vdc=2Vm/pi,Idc=2Im/pi ,Irms=Im/root(2),Vrms=Vm/root(2) (Im:Peak Curent) n=(4Vm*Im/pi^2)/(Vm*Im/2)=8/pi^2=0.812=81.2%. So efficiency of full wave rectifier is 81.2%

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