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+//chapter9
+//example9.12
+//page153
+
+Vdc=50 // V
+rf=25 // ohm
+Rl=800 // ohm
+
+// Vdc=Idc*Rl and Idc=Im/%pi so
+// Vdc=Im*Rl/%pi
+// but Im=Vm/(rf+Rl) so
+// Vdc=Vm*Rl/(%pi*(rf+Rl))
+// making Vm as subject we get
+
+Vm=Vdc*%pi*(rf+Rl)/Rl
+
+printf("ac voltage required = %.1f V \n",Vm)