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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)
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