initial commit / add all books

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diff --git a/887/CH13/EX13.4/13_4.sce b/887/CH13/EX13.4/13_4.sce
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+clc

+//ex13.4

+V_CC=15;

+B=100;      //beta value

+R_B=200*10^3;

+R_C=1*10^3;

+//we proceed in such a way that the required values will be displayed according to the satisfied condition of the below three cases

+

+//a)cut-off region

+V_BE=15;      //no voltage drop across R_B in cut-off state

+V_CE=15;      //no voltage drop across R_C in cut-off state

+i_C=0;      //no collector current flows as there is no voltage drop

+i_B=0;      //no base current flows as there is no voltage drop

+if(V_BE<0.5) then,      //cut-off condition

+    disp(i_C,'collector current in amperes')

+    disp(V_CE,'collector to emitter voltage in volts')

+    end

+

+//b)saturation region

+V_BE=0.7;      //base to emitter voltage in saturation state

+V_CE=0.2;      //collector to emitter voltage in saturation state

+i_C=(V_CC-V_CE)/R_C;      //collector current

+i_B=(V_CC-V_BE)/R_B;      //base current

+if((B*i_B>i_C)&(i_B>0)) then,      //saturation state conditions

+        disp(i_C,'collector current in amperes')

+        disp(V_CE,'collector to emitter voltage in volts')

+    end

+

+//c)active region

+V_BE=0.7;      //base to emitter voltage in active state

+i_B=(V_CC-V_BE)/R_B;      //base current

+i_C=B*i_B;      //collector current in active state

+V_CE=V_CC-i_C*R_C;      //collector to emitter voltage

+if((V_CE>0.2)&(i_B>0)) then,      //active state conditions

+        disp(i_C,'collector current in amperes')

+        disp(V_CE,'collector to emitter voltage in volts')

+    end