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+o//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 3
+//example 3.1
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+Vrms=110;                  //source voltage of the circuit in volts
+alpha=90;                 //triggering angle in degree
+Vm=Vrms*(2)^(1/2);       //maximum voltage in volts
+Vave=(Vm/(2*%pi))*(1+cosd(alpha));
+R=(0.2*(Vave)^(2))+5;   //load resistance in ohm
+Iave=Vave/R;           //average current of the load
+disp(Iave,'The average current when the triggering angle 90 degree in ampere is:')