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+//Caption:Find the efficiency of transformer at full load and 75 percent of full load (a)at unity power factor (b)0.8 power factor

+//Exa:3.16

+clc;

+clear;

+close;

+I_2=200;//in amperes

+R_O2=0.008;//in ohms

+x=0.75;

+P_cu=x^2*I_2^2*R_O2;//in watts

+P_i=190;//in watts

+KVA=40;

+P_o=40*1000;//in watts

+Eff=P_o/(P_o+P_i+I_2^2*R_O2);

+Eff_2=KVA*1000*0.8/(KVA*1000*0.8+P_i+I_2^2*R_O2);

+disp(Eff*100,'(a)Efficiency of transformer at full load and at unity power factor (in %)=');

+disp(Eff_2*100,'(b)Efficiency of transformer at full load and at 0.8 power factor (in %)=');

+Eff_3=x*P_o/(x*P_o+P_i+P_cu);

+Eff_4=x*P_o*0.8/(x*0.8*P_o+P_i+P_cu);

+disp(Eff_3*100,'(a)Efficiency of transformer at 75% of load and at unity power factor (in %)=');

+disp(Eff_4*100,'(b)Efficiency of transformer at 75% of load and at 0.8 power factor (in %)=');
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