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+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi

+//chapter 3

+//example 3.8

+//edition 1

+//publisher and place:Nelson Engineering

+clc;

+clear;

+Vab=208;//source voltage in volts

+Vs=Vab/3^(1/2);//rms voltage in volts

+Vm=Vs*2^(1/2);//maximum peak voltage in volts

+R=10;//resistance of the circuit in ohm

+a1=80;//triggering angle 1 in degree

+a2=30;//triggering angle 2 in degree

+if a1<60 then

+    disp(a1,'The current is discontinous')

+else if (a2>60)

+        disp(a2,'The current is discontinous')

+end

+disp('To find the power delivered at a1=80 degree:') 

+B1=180;

+p=(((3*Vm^(2))/(8*%pi*10))*(2*(B1-a1)*(%pi/180)+sind(2*a1)-sind(2*B1)));//power delivered when triggering angle a1=180 degree

+P=p*10^-3;//power interms of kilowatt

+disp(P,'The power delivered at the triggering angle 80 degree in kilowatt is')

+disp('To find the power delivered at a2=30 degree:')

+B2=120+a2;

+p1=(((3*Vm^(2))/(8*%pi*10))*(2*(B2-a2)*(%pi/180)+sind(2*a2)-sind(2*B2)));//power delivered when triggering angle a2=30 degree

+P1=p1*10^-3;//power interms of kilowatt

+disp(P1,'The power delivered at the triggering angle 80 degree in kilowatt is')