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+//===========================================================================
+//chapter 11 example 7
+
+clc;
+clear all;
+
+//variable declaration
+R1          = 1.0;      //resistace in Ω
+V1           = 0.8-%i*0.75;     //voltage drop across the resistance in volt
+V2           = 1.2+%i*0.3;     //voltage across the coil in volt
+
+//calculations
+I       = V1/R1;        //current through coil in A
+x       = (atan(imag(V1)/real(V1)))*180/%pi;
+y       = (atan(imag(V2)/real(V2)))*180/%pi;
+phi     = y-x;
+a       =sqrt(((real(V2))^2)+((imag(V2))^2));
+b       =sqrt(((real(I))^2)+((imag(I))^2));
+V3      = a*cos(phi*%pi/180);          //resistive drop the coil in V
+P       = a*b*cos(phi*%pi/180);         //power loss in the coil in W
+
+
+//result
+mprintf("iron loss in the coil =%3.3f watt",P);