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+//Network Theorem 1

+//page no-3.32

+//example3.27

+//calculation of Isc (short-circuit current)

+disp("Applying KVL to mesh 1:");

+disp("20*I1-20*I2=10");....//equation 1

+disp("Applying KVL to mesh 2:"); 

+disp("-20*I1+60*I2-20*I3=40");....//equation 2

+disp("Applying KVL to mesh 3:");

+disp("-20*I2+50*I3=-100");....//equation 3

+disp("solving these equations we get :");...//solving equations in matrix form

+A=[20 -20 0;-20 60 -20;0 -20 50];

+B=[10 40 -100]'

+X=inv(A)*B;

+disp(X);

+disp("I1 = 0.81A");

+a=0.81;

+printf("\nIsc = -%.2f A",a);

+//calculation of Rn (norton's resistance)

+disp("replacing the voltage source with short circuit ");

+c=20;

+b=30;

+x=(c*b)/(c+b);

+y=x+c;

+z=(y*c)/(y+c);

+printf("\nRn = %.1f Ohm",z);

+//calculation of IL (load current)

+n=10;

+i=a*(z/(z+n));

+printf("\nIL = %.2f A",i);
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