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diff --git a/1319/CH5/EX5.5/5_5.sce b/1319/CH5/EX5.5/5_5.sce
new file mode 100644
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+//Voltage regulation at 0.8 pf lagging
+
+clc;
+clear;
+
+E1=1100;
+E2=110;
+
+P=5*(10^3);
+
+I=P/E1; // Primary full load current
+
+I2=P/E2;// Secondary full load current
+
+V=33;
+
+pf=0.8; // Power Factor lagging, so the angle is positive
+
+theta=acosd(pf);// Power factor angle
+
+Pc=85;
+
+R=Pc/(I^2);
+
+Z=V/I;
+
+V1=E1;
+
+X=sqrt((Z^2)-(R^2));
+
+// Using equation 5.22 to determine V2
+
+V2=poly([0 1],'V2','c');
+
+x=(V2^2)+(2*V2*I*R*pf)+(2*V2*I*X*sind(theta))+((I^2)*((R^2)+(X^2)))-(V1^2);
+
+r=roots(x);
+
+a1=sqrt(r(1));
+a2=sqrt(r(2));
+
+if(imag(a1))
+    V2=r(2);
+else
+    if(imag(a2))
+        V2=r(1);
+    else
+        disp('Error')
+    end
+end
+
+reg=(V1-V2)/V2; // Voltage regulation
+
+regper=reg*100;// Voltage regulation percent
+
+disp(x,'The characteristic equation to find V2 equated to zero is')
+
+disp(regper,'The percentage voltage regulation for a load at 0.8 pf lagging is')
+    
+
+