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+//CHAPTER 7- SINGLE PHASE TRANSFORMER
+//Example 41
+
+disp("CHAPTER 7");
+disp("EXAMPLE 41");
+
+//3-phase 550/440 V star connected transformer supplies a load of 400kW
+//VARIABLE INITIALIZATION
+v1=550;                         //primary voltage in Volts
+v2=440;                         //secondary voltage in Volts
+p=400*1000;                     //load in Watts
+pf=0.8;                         //power factor(lagging)
+
+//SOLUTION
+
+//solution (a)
+I2=p/(sqrt(3)*v2*pf);           //current on secondary side
+I1=I2*(v2/v1);                 //since I1:I2=N2:N1
+I=I2-I1;                       //in sections Oa, Ob and Oc
+disp(sprintf("(a) The current flowing in sections Oa, Ob and Oc is %.0f A",I));
+disp(sprintf("The current flowing in sections aA, bB and cC is %.0f A",I1));
+
+//solution (b)
+//power transferred by transformer action = Pin.(1-k)
+p_o=p*(1-(v2/v1));             //k=v2/v1
+disp(sprintf("(b) The power transferred by transformer action %.0f kW",p_o/1000));
+
+//solution (c)
+p_d=p-p_o;
+disp(sprintf("(c) The power conducted directly %d kW",p_d/1000)); 
+
+//END