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+//CHAPTER 7- SINGLE PHASE TRANSFORMER
+//Example 17
+
+disp("CHAPTER 7");
+disp("EXAMPLE 17");
+
+//VARIABLE INITIALIZATION 
+va=200000;                      //
+ironLoss=1000;                  // Watts
+cuLoss=2000;                    //Watts
+pf=0.8;
+//
+//SOLUTION
+// 
+Pout=va*pf;
+loss=ironLoss+cuLoss;
+Pin=Pout+loss;
+eff=Pout*100/Pin;
+disp("SOLUTION (a)");
+disp(sprintf("The percent efficiency at full load is %f",eff)); 
+//
+//at half load
+Pout=va*pf/2;
+loss=ironLoss+cuLoss*(1/2)^2;
+Pin=Pout+loss;
+eff=Pout*100/Pin;
+disp("SOLUTION (b)");
+disp(sprintf("The percent efficiency at full load is %f",eff)); 
+//
+//fraction x of copperloss=ironloss for maximum efficiency
+//x^2.cuLoss=ironLoss
+x=sqrt(ironLoss/cuLoss);
+Pout=x*va*pf;
+loss=ironLoss+cuLoss*x^2;
+Pin=Pout+loss;
+eff=Pout*100/Pin;
+disp("SOLUTION (c)");
+disp(sprintf("The percent efficiency at %f load is %f ",x,eff)); 
+
+disp(" "); 
+// 
+//END