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+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter3
+//example 3.2
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+Vsrms=110;                 //source voltage of the circuit in volts
+Vm=Vsrms*(2)^(1/2);       //maximum voltage in volts
+R=2;                     //resistance in ohm
+alpha1=45;              //triggering angle in degree
+alpha2=90;             //triggering angle in degree
+//when a1=45
+disp('case 1')
+Vrms=(Vsrms/(2)^(1/2))*(1-(alpha1*(%pi/180)/%pi)+(sind(2*alpha1)/(2*%pi)))^(1/2);
+disp(Vrms,'rms voltage across the load resistance in volt is:')
+Irms=Vrms/R ;
+disp(Irms,'rms current of the resistance in ampere is:')
+Vscr=-(Vm/(2*%pi))*(1+cosd(alpha1));
+disp(Vscr,'average voltage drop across the SCR in volt is:')
+//when a2=90
+disp('case 2')
+Vrms1=(Vsrms/(2)^(1/2))*(1-(alpha2*(%pi/180)/%pi)+(sind(2*alpha2)/(2*%pi)))^(1/2);
+disp(Vrms1,'rms voltage across the load resistance in volt is:')
+Irms1=Vrms1/R ;
+disp(Irms1,'rms current of the resistance in ampere is:')
+Vscr1=-(Vm/(2*%pi))*(1+cosd(alpha2));
+disp(Vscr1,'average voltage drop across the SCR in volt is:')