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//===========================================================================
//chapter 8 example 10
clc;clear all;
//variable declaration
V = 230; //voltage in V
I = 10; //current in A
T = 30; //time in minutes
x =0.8; //power factor
n = 890; //number of revolutions made
M = 1200; //meter constant in revolutions per kWh
E = 58.25; //dial reading at the end of test
E1 = 57.35; //dial reading at the start of test
//calculations
Ea = (V*I*(T/(60))*x)/(1000); //Energy consumed 1 minute
Em = E-E1; //energy consumption recorded by the meter in kWh
e = Em-Ea; //error in registration in kWh
N = M*Em; //actual revolutions required to be made by the meter for an energy consumption of 0.90kWh
e = (n-N)/(T); //error in rpm
//result
mprintf("error = %3.2f rpm",e);
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