initial commit / add all books

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diff --git a/2885/CH3/EX3.13/ex3_13.sce b/2885/CH3/EX3.13/ex3_13.sce
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+//determine value of the series resistor and wattage rating

+clear;

+clc;

+//soltion

+//given

+Vi=12;//V       //input voltage

+Vz=7.2;//V        //Zener voltage

+Izmin=10*10^-3;//A             //min current through zener diode

+Ilmax=100*10^-3;//A            //max current through load

+Ilmin=12*10^-3;//A            //min current through load

+

+Vs=Vi-Vz;       //Voltage drop across the series resistor

+Is=Izmin+Ilmax;     //Current through the series resistor

+Rs=Vs/Is;

+printf("The series resistor so that 10mA current flow through zener diode is %.1f Ω\n",Rs);

+

+Izmax=Is-Ilmin;      //max zener through zener diode

+Pmax=Izmax*Vz;

+printf("The maximum wattage rating is %.1f mW",Pmax*1000);