initial commit / add all books

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diff --git a/431/CH3/EX3.15/EX3_15.sce b/431/CH3/EX3.15/EX3_15.sce
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+//Calculate percentage regulation

+//Chapter 3

+//Example 3.15

+//page 217

+clear;

+clc; 

+disp("Example 3.15")

+kVA=30;                //rating of the transformer

+V1=6000;                //primary voltage in volts

+V2=230;                //secondary voltage in volts

+R1=10;                //primary resistance in ohms

+R2=0.016;              //secondary resistance in ohms

+Xe=23;                    //total reactance reffered to the primary

+phi=acosd(0.8);                //lagging

+Re=(R1+((V1/V2)^2*R2))

+printf("equivalent resistance,Re=%fohms",Re)

+I2dash=(kVA*1000)/V1;

+V2dash=5847;

+Reg=((I2dash*((Re*cosd(phi))+(Xe*sind(phi))))*100)/V2dash;

+printf("\npercentage regulation=%fpercent",Reg)
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diff --git a/431/CH3/EX3.15/resultEX3_15.txt b/431/CH3/EX3.15/resultEX3_15.txt
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+  

+ Example 3.15   

+equivalent resistance,Re=20.888469ohms

+percentage regulation=2.609097percent 
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