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+//===========================================================================
+//chapter 3 example 15
+
+clc;clear all;
+
+//variable decelaration
+er     = 0.015;                  //limiting error 
+V    = 100;                      //range of voltmeter in V
+I   = 150;                       //range of ammeter in mA
+V1     = 70;                     //magnitude of voltage being measured in V
+I1     = 80;                     //magnitude of current being measured in mA
+
+//calculations
+dV   = er*V;                    //magnitude(dV/V of limiting error of the voltmeter in V
+eV     = (dV/(V1))*100;    //percentage(dI/I) limitng error at this voltage in %
+dI     = er*I;                  //magnitude of limitng error off the ammeter  in mA
+eI     = (dI/(I1))*100;    //percentage limitng error at this current in %
+P      = V1*(I1/(1000));                 //power in W
+dPx    = eV+eI;           //relative limiting error(dPx/Px) in power measurement in %
+
+//result
+mprintf("relative limitng error in power measurement= %3.4f percentage",dPx);