Xcos examples from textbooks and for blocksHEADmaster

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diff --git a/Working_Examples/215/CH7/EX7.3/ex7_3.sce b/Working_Examples/215/CH7/EX7.3/ex7_3.sce
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+clc

+//Example 7.3

+//Let wc be the energy stored in capacitor

+C=20*10^-6; R=10^6;

+t=0:0.001:0.5

+v=100*sin(2*%pi*t)

+wc=0.5*C*v^2

+plot(t,wc)

+xtitle('wC vs t','t in sec','wC in J')

+//Let iR be the current in the resistor

+iR=v/R

+//Let pR be the power dissipated in the resistor

+pR=iR^2*R

+//If wR is the energy dissipated in the resistor

+syms s

+wR=integ(100*(sin(2*%pi*s))^2,s,0,0.5)

+disp(wR,'wR=')

+