initial commit / add all books

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diff --git a/431/CH3/EX3.13/EX3_13.sce b/431/CH3/EX3.13/EX3_13.sce
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+//Calculate current and power input

+//Chapter 3

+//Example 3.13

+//page 216

+clear;

+clc; 

+disp("Example 3.13")

+R1=0.21;                    //primary resistance in ohms

+X1=1;                        //primary reactance in ohms

+R2=2.72*10^(-4);            //secondary resistance in ohms

+X2=1.3*10^(-3);              //secondary reactanced in ohms

+V1=6600;                      //primary voltage in volts

+V2=250;                        //secondary voltage in volts

+r=V1/V2;                         //turns ratio

+Re=R1+(r^2*R2);

+printf("Equivalent resistance referred to primary side=%fohms",Re);

+Xe=X1+(r^2*X2);

+printf("\nEquivalent reactance referred to primary side=%fohms",Xe);

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

+printf("\nequivalent impedance reffered to primary,Ze=%fohms",Ze);

+V=400;                        //voltage in volts

+I1=V/Ze;

+printf("\nI1=%f",I1);

+printf("\nPower input=%fW",(I1^2*Re));

+

diff --git a/431/CH3/EX3.13/resultEX3_13.txt b/431/CH3/EX3.13/resultEX3_13.txt
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+  

+ Example 3.13   

+Equivalent resistance referred to primary side=0.399573ohms

+Equivalent reactance referred to primary side=1.906048ohms

+equivalent impedance reffered to primary,Ze=1.947480ohms

+I1=205.393656

+Power input=16856.612924W 
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