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+//Example No. 5.19
+clc;
+clear;
+close;
+format('v',7);
+
+//Given Data : 
+V=230;//V
+f=50;//Hz
+Rf=200;//ohm
+Ra=0.25//ohm
+Kv=1.1;//V/A-rad/s
+Kt=1.1;//N-m/A^2
+alfa_a=45;//degree
+Ia=50;//A
+alfa_f=0;
+Vf=2*V*sqrt(2)/%pi*cosd(alfa_f);//V
+Va=2*V*sqrt(2)/%pi*cosd(alfa_a);//V
+If=Vf/Rf;//A
+T=Kt*Ia*If;//N-m
+Eb=Va-Ia*Ra-2;//V
+omega=Eb/Kv/If;//rad/s
+Eg=-Eb;//V
+Va=Eg+Ia*Ra+2;//V
+alfa=acosd(Va/2/V/sqrt(2)*%pi);//degree
+disp(alfa,"Fringe angle to converter in degree : ");
+P=abs(Va)*Ia;//W(power fed back to source)
+disp(P,"Power fed back to source in Watts : ");
+//Answer wrong in the book.