initial commit / add all books

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diff --git a/1850/CH1/EX1.18/exa_1_18.sce b/1850/CH1/EX1.18/exa_1_18.sce
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+// Exa 1.18

+clc;

+clear;

+close;

+// Given data

+format('v',7)

+V_BE=0.7;// in volt

+V_CC=9;// in volt

+R1=12;// in k ohm

+R1=R1*10^3;// in ohm

+Bita=100;

+Bita_1= Bita;

+Bita_2=Bita;

+Bita_3=Bita;

+I_REF= (V_CC-2*V_BE)/R1;// in amp

+disp(I_REF*10^3,"Reference current in mA");

+I_out= I_REF/(1+2/(Bita*(1+Bita_3)));// in amp

+disp(I_out*10^3,"Output current in mA");

+I_C2=I_out;// in amp

+disp(I_C2*10^3,"Collector current in mA");

+I_C1= I_C2;

+I_B3= I_REF-I_C1;// in amp

+disp(I_B3*10^6,"Base current of transistor in micro amphere");

+I_E3= I_B3*(1+Bita_3);// in  amp

+disp(I_E3*10^6,"Emitter current of transistor in micro amphere");

+I_B1= I_E3/2;// in amp

+disp(I_B1*10^6,"Base current in micro amphere");