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+//Ex3.5.5
+//calculation of necessary ac input power for HWR and FWR
+clc;
+clear;
+//given
+Pl_dc=500;//dc load power
+n_HWR=0.4;//efficiency for half wave rectifier
+n_FWR=0.812// efficiency for full wave rectifier
+Pac_HWR=Pl_dc/n_HWR;
+disp('**** half wave rectifier ****')
+disp('Watt',Pac_HWR,'necessary ac input power is :')
+Pac_FWR=Pl_dc/n_FWR;
+disp('**** full wave rectifier ****')
+disp('Watt',Pac_FWR,'necessary ac input power is :')