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diff --git a/1523/CH3/EX3.15/3_15.sce b/1523/CH3/EX3.15/3_15.sce
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+//Network Theorem 2
+//pg no 3.16
+//example 3.15
+a=10;
+b=2;
+c=(5*a)-(20*b);
+x=20;
+y=30;
+z=5;
+r=z+((x*y)/(x+y));
+i=c/(r+c);
+//Calculation of Vth(Thevenin's voltage)
+disp("removing the 10 ohm resistor from the circuit");
+printf("\nFor mesh 1, \nI1 = %.f A",a);
+printf("\nApplying KVL to mesh 2,, \nI2 = %.f A",b);
+printf("\nWriting Vth equation, \n Vth = %.f V",c);
+//Calculation of Rth(Thevenin's Resistance)
+disp("replacing the current source of 10 A with an open circuit  and voltage source of 100 V with a short circuit,");
+printf("\nRth = %.f Ohm",r);
+//Calculation of IL(load current)
+printf("\nIL = %.2f A",i);
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