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//========================================================
//chapter 5 example 5
clc;clear all;
//variable decalaration
Iac = 0.1; //current in A
f = 50; //frequency in Hz
L = 0.8; //inductance in H
Vac = 300; //voltage in V
V = 200; //true value in V
//calculations
XL = 2*%pi*f*L; //instrument reactance in Ω
Z = Vac/(Iac); //instrument impedance in Ω
R1 = sqrt((Z^2)-(XL^2)); //instrument resistance(R+r) in Ω
Idc = V/(R1); //instrument current when connected to 200V dc supply
V1 = (Idc*Vac)/(Iac); //reading of the instrument when connected to 200V dc supply
e = ((V1-V)/(V))*100;
//result
mprintf("percentage error = %3.2f percentage",e);
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