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+//===========================================================================
+//chapter 6 example 17
+
+clc;clear all;
+
+//variable declaration
+Tp = 1; //number of turns in primary
+KT = 200; //turns ratio
+Is = 5; //secondary current in A
+Rs = 1.5; //secondary burden in Ω
+f = 50; //frequency in Hz
+L =1.5; //iron loss in Watts
+Ie = 40; //current in A
+
+//calculaations
+Ts = KT*Tp; //number of turns in secondary
+Vs = Is*Rs; //secondary voltage in V
+phimax = Vs/(4.44*f*Ts); //flux inn the core in mWb
+Il = L/(Vs); //iron-loss in the secondary side in A
+Ip = KT*Il; //iron-loss current in primary side in A
+x =(KT*Is)+Ie;
+e = ((-Ie/((x))))*100; //ratio error in %
+
+//result
+mprintf("flux in the core = %3.3e percentage mWb",(phimax*10^3));
+mprintf("\nratio error = %3.4f percentage",e);
+