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+//Electric Drives:concepts and applications by V.subrahmanyam
+//Publisher:Tata McGraw-Hill 
+//Edition:Second 
+//Ex4_9
+clc;
+clear;
+V1=500;// voltage in V
+V2=450;// voltage in V
+Vs=420;// voltage in V
+V=400;// voltage in V
+I=60;//Current in A
+R=1.5;// Resistance in ohm
+R1=5;// Resistance in ohm
+Eb=20;//Back emf in V
+f=50;//frequency in Hz
+Vl=V2+Eb;		
+A=acos(Vl/(1.35*Vs));
+Alpha1=(A*180)/%pi;
+Eb1=V2-(I*R);
+disp(Eb1,"The back emf in V is:")
+V3=-V2-(I*R);
+Vc=-V2+Eb;
+A1=acos(Vc/(1.35*Vs));
+Alpha2=(A1*180)/%pi;
+disp(Alpha2,"The firing angle1 in deg is:")
+Eb2=-V-(I*R);
+Vc1=-V+Eb+(R1*I);
+A2=acos(Vc1/(1.35*Vs));
+Alpha3=(A2*180)/%pi;
+disp(Alpha3,"The firing angle2 in deg is:")