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+//chapter9
+//example9.14
+//page157
+
+rf=0
+n=5
+Vp=230 // V rms
+Rl=100 //ohm
+
+Vs=Vp/n // V rms
+Vsm=Vs*2^0.5 // maximum voltage across secondary 
+Vm=Vsm/2 // maximum voltage across half secondary winding
+
+Idc=2*Vm/(%pi*Rl)
+Vdc=Idc*Rl
+PIV=Vsm
+efficiency=100*0.812/(1+rf/Rl)
+
+printf("dc output voltage = %.3f V \n",Vdc)
+printf("PIV = %.3f V \n",PIV)
+printf("efficiency = %.3f percent \n",efficiency)