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diff --git a/1628/CH3/EX3.9/Ex3_9.sce b/1628/CH3/EX3.9/Ex3_9.sce
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+
+
+                             // Examle 3.9
+
+Is=3;                     // Source current
+Rs=2;                     // Source resistance
+Vs=Rs*Is;                 // Source voltage
+Rl=4;                     // Load resistance
+R=(Rs*Rl)/(Rs+Rl);        // Eqviualent resistance
+Il1=(Is*Rs)/(Rs+Rl);      // Load current in case-1
+disp(' Load current in case-1 = '+string(Il1)+' Amp');
+
+Vl1=1*Rl;                 // Load voltage in case-1
+disp(' Load voltage in case-1 = '+string(Vl1)+' Volt');
+
+Ps1=Is^2*R;               // Power delivered in case-1
+disp(' Power delivered in case-1 = '+string(Ps1)+' Watt');
+
+Il2=Vs/(Rs+Rl);           // Load current in case-2
+disp(' Load current in case-2 = '+string(Il2)+' Amp');
+
+Vl2=Vs*(Rl/(Rl+Rs));      // Load voltage in case-2
+disp(' Load voltage in case-2 = '+string(Vl2)+' Volt');
+
+Ps2=Vs^2/(Rs+Rl);         // Power delivered in case-2
+disp(' Power delivered in case-2 = '+string(Ps2)+' Watt');
+
+
+
+
+                  //       p 61        3.9
+