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+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter2
+//example 2.2
+clc;
+clear;
+sv=(2^(1/2))*120*sind(30);//rms value of voltage source
+K=0.2; // constant whose value dependent ondevice characteristics
+bv=200; //base voltage in volts
+ig=((log(sv/bv))/(-K)); //gate current in mA
+disp(ig,'gate current required to trigger the SCR at 30 degree in milliamphere is')