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diff --git a/431/CH3/EX3.19/EX3_19.sce b/431/CH3/EX3.19/EX3_19.sce
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+//Calculating the efficiency and voltage regulation//Chapter 3

+//Example 3.19

+//page 225

+clear;

+clc;

+disp("Example 3.19")

+kVA=50;                        //rating of the transformer

+V1=3300;                        //open circuit primary voltage

+Culoss=540;                    //copper loss from short circuit test

+coreloss=460;                  //core loss from open circuit test

+V1sc=124;                      //short circuit primary voltage in volts

+I1sc=15.4;                      //short circuit primary current in amperes

+Psc=540                         //short circuit primary power in watts       

+phi=acosd(0.8)

+effi=(kVA*1000*cosd(phi)*100)/((kVA*1000*cosd(phi))+Culoss+coreloss)

+printf("From the open-circuit test, core-loss=%dW",coreloss);

+printf("\nFrom short circuit test, copper loss=%dW",Culoss);

+printf("\nThe efficiency at full-load and 0.8 lagging power factor=%f",effi);

+Ze=V1sc/I1sc;

+Re=Psc/I1sc^2;

+Xe=sqrt(Ze^2-Re^2);

+V2=3203;

+phi2=acosd(0.8);

+phie=acosd(Culoss/(V1sc*I1sc));

+reg=(V1sc*cosd(phie-phi2)*100)/V1;

+printf("\nVoltage regulation=%dpercent",reg)
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diff --git a/431/CH3/EX3.19/resultEX3_19.txt b/431/CH3/EX3.19/resultEX3_19.txt
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+  

+ Example 3.19   

+From the open-circuit test, core-loss=460W

+From short circuit test, copper loss=540W

+The efficiency at full-load and 0.8 lagging power factor=97.560976

+Voltage regulation=3percent 
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