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+//Ex 3.13 page 126
+
+clc;
+clear;
+close;
+
+n=3;// no. of phase
+Vs=400;// V
+f=50;// Hz
+Io=100;// A
+alpha = 60;// degree
+
+Vm=Vs*sqrt(2);// V
+Vo=n*Vm/%pi*cos(alpha*%pi/180);// V
+Po=Vo*Io;// W
+printf(' (i)')
+printf('\n Output voltage = %.0f V',Vo)
+printf('\n Output power = %.0f W',Po)
+printf('\n\n (ii)')
+Iav=Io*2*%pi/3/2/%pi;// A
+printf('\n average current through thyristor = %.2f A', Iav)
+Ior=sqrt(Io**2*2*%pi/3/2/%pi);// A
+printf('\n rms current through thyristor = %.2f A', Ior)
+Ip=Io;//A
+printf('\n peak current through thyristor = %.2f A', Ip)
+printf('\n\n (iii)')
+PIV=sqrt(2)*Vs;//V
+printf('\n PIV of thyristor = %.1f V',PIV)
+// Ans in the book is not accurate.