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//chapter 3
//example 3.7
//page 89
printf("\n")
printf("given")
Vf=.7;Eo=21;Il=40*10^-3;Vp=115;
Vs=.707*(Vf+Eo);
printf(" Vrms voltage is %3.3fV\n",Vs)
Is=3.6*Il;
printf(" rms current is %3.3fA\n",Is)
Ip=(Vs*Is)/Vp;
printf("primary current is %3.3fA\n",Ip)