initial commit / add all books

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diff --git a/1529/CH18/EX18.2/18_02.sce b/1529/CH18/EX18.2/18_02.sce
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+//Chapter 18, Problem 2

+clc;

+//initializing the variables:

+c = 4E-6;                       //capacitance in farad

+r = 220000;                     //resistance in ohm

+V = 24;                         //supply voltage

+t1 = 1.5; 

+

+//calculation:

+taw = r*c

+t = 0:0.1:10

+Vc = V*(1-%e^(-1*t/taw));

+plot2d(t,Vc)

+xtitle("capacitor voltage/time characteristic", "t", "Vc")

+xset('window',1)

+VR = V*(1-%e^(-1*t/taw));

+plot2d(t,VR)

+xtitle("resistor voltage/time characteristic", "t", "VR")

+xset('window',2)

+I = V/r

+i = I*%e^(-1*t/taw)

+plot2d(t,i)

+xtitle("current/time characteristic", "t", "i")

+Vct1 = V*%e^(-1*t1/taw)

+VRt1 = V*%e^(-1*t1/taw)

+it1 = I*%e^(-1*t1/taw)

+

+printf("\n The value of capacitor voltage is %.2f V,\n\n resistor voltage is %.2f V,\n\n current is %.1E A at one and a half seconds after discharge has started.",Vct1, VRt1,it1)