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diff --git a/1319/CH5/EX5.9/5_9.sce b/1319/CH5/EX5.9/5_9.sce
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+// Regulation at full load p.f 0.8 lag
+
+clc;
+clear;
+
+Pi=500*(10^3);// Power Input
+Meff=97/100;// Max Efficiency
+pf1=1;
+
+E1=3300;
+E2=500;
+
+Po=Pi*pf1*3/4;
+
+// Iron loss = Copper loss at maximum efficiency
+
+x=poly([0 1],'x','c');
+
+Pin=Po+(2*x);
+
+xx=(Pin*Meff)-Po;
+
+x=roots(xx); // Iron Loss = Copper Loss
+
+I2=Po/E2;
+
+R=x/(I2^2);
+
+I2fl=Pi/E2;
+
+Rfl=E2/I2fl;
+
+// Per unit values
+Rpu=R*100/Rfl;
+Zpu=10;
+Xpu=sqrt((Zpu^2)-(Rpu^2));
+
+pf2=0.8; // Lagging
+
+ang=acosd(pf2);// Positive Angle as it is lagging
+
+perreg=(Rpu*cosd(ang))+(Xpu*sind(ang));
+
+printf('The regulation at full load, p.f 0.8 lag = %f percent\n',perreg)