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+//Example 1_21
+clc;
+clear;
+close;
+format('v',5);
+//given data :
+V1=90;//V
+V2=50;//V
+V3=100;//V
+R1=60;//ohm
+R2=40;//ohm
+R3=30;//ohm
+R4=60;//ohm
+R=6:36;//ohm
+//Open circuit AB
+I1=V1/(R1+R3);//A
+I2=V3/(R2+R4);//A
+//Potential of point A
+VA=I1*R3+V2;//V
+//Potential of point B
+VB=I2*R4;//V
+VOC=VA-VB;//V
+Req=R1*R3/(R1+R3)+R2*R4/(R2+R4);//ohm
+Imin=VOC/(Req+max(R));//A
+Imax=VOC/(Req+min(R));//A
+disp("The current through resistor R will vary from "+string(Imin)+" A to "+string(Imax)+" A.");