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+//Example 9.1.//energy lost and total energy
+clc;
+clear;
+close;
+//given data :
+format('v',7)
+V=600;// in volts
+I=350;//in A
+Ts=20;// in sec
+R=0.15;// in ohm
+E_bse=(V/2)-(I*R);
+E_bp=V-(I*R);
+Tse=(E_bse/E_bp)*Ts;
+Tp=Ts-Tse;
+Vd=V-(2*I*R);
+Ed1=(Vd/2)*I*(Tse/3600);
+Ed2=((V/2)/2)*2*I*(Tp/3600);
+El=(Ed1+Ed2)*10^-3;
+disp("part (a)")
+disp(El,"Energy lost in starting rhestat,El(kWh) = ")
+El_1=(2*(I^2)*R*Ts)/(3600*1000);
+disp("part (b)")
+disp(El_1,"Energy lost in  motors,El(kWh) = ")
+//answer is wrong in  part b in the textbook
+Et=((V*I*Tse)+(2*V*I*Tp))/(3600*1000);
+disp("part (c)")
+disp(Et,"Total Energy,Et(kWh) = ")