initial commit / add all books

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diff --git a/215/CH11/EX11.2/ex11_2.sce b/215/CH11/EX11.2/ex11_2.sce
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+clc

+//Example 11.2

+//Calculate the average power 

+printf("Given")

+disp('v=4*cos(%pi/6*t), V=4(0 deg), Z=2(60 deg)')

+Vamp=4;Vang=0;Zamp=2;Zang=60;

+//Let I be the phasor current

+Iamp=Vamp/Zamp

+Iang=Vang-Zang

+P=0.5*Vamp*Zamp*cos((Zang*%pi)/180)

+printf("P=%d W \n",P);

+t=-1:1:15

+t1=-3:1:12

+v=Vamp*cos(%pi/6*t)

+//i=2*cos((%pi/6)*t-(%pi/3))

+i=Iamp*cos(%pi/6*t+((Iang*%pi)/180))

+figure

+a= gca ();

+plot (t,v,t,i)

+xtitle ('v,i vs t' ,'t' ,'v,i');

+a. thickness = 2;

+//Instantaneous power p=v*i

+//On solving

+p=2+4*cos(%pi/3*t+((Iang*%pi)/180))

+figure

+a= gca ();

+plot (t,p)

+xtitle ('p vs t' ,'t' ,'p');

+a. thickness = 2;