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+//Example 6.4// ratio error and phase angle error
+clc;
+clear;
+Ns=250;//no. of secondary turns
+Rp=1.4;//in ohms
+f=50;//frequency in hertz
+Np=1;//no. of primary turns
+Is=5;//SECONDARY WINDING CURRENT IN AMPERE
+Re=1.1;//external burden in ohms
+mmf=80;//magneromotive force in AT
+Il=1.1;//IRON LOSS IN WATTS
+Kt=Ns/Np;//turn ratio
+Se=sqrt(Rp^2+Re^2);//secomdary circuit impedance in ohms
+csd=Rp/Se;//cos angle
+sd=Il/Se;//SIN ANGLE
+
+Es=Is*Se;//voltage induced in secondary winding
+Ep=Es/Kt;//primary voltage
+Iw= Il/Ep;//loss component in ampere
+Im= mmf/Np;//magnetising component of current in ampere
+Kact= Kt+((Im*sd)+(Iw*csd))/Is;//actual ratio
+Re= ((Kt-Kact)/Kact)*100;//ratio error in percentage
+Pa=((180/%pi)*(Im*csd-Iw*sd)/(Kt*Is));//phase angle in degree
+disp(Re,"ratio error in percentage is")
+disp(Pa,"phase angle in degree is")