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+//Chapter 21, Problem 18

+clc;

+vi=200e3;                       //rated transformer

+pf=0.85;                        //power factor

+lcu=(1/2)^2*1.5e3;              //copper loss

+lfe=1e3;                        //iron loss

+p0=(1/2)*vi*pf;                 //full-load output power

+lt=lcu+lfe;                     //total losses

+pi=p0+lt;                       //input power

+Ef=(1-(lt/pi));                 //efficiency

+printf("Transformer efficiency at half load = %.3f percent",Ef*100);