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//===========================================================================
//chapter 7 example 7
clc;clear all;
//variable declaration
V = 250; //load voltage in V
I = 12; //load current in A
Rc = 0.1; //resistance in Ω
Rp =6500; //resistance in Ω
x = 1; //pf cos(phi)
y = 0.4; //pf cos(phi)
//calculations
P = V*I*x; //power input to the apparatus in W
PL = (I^2)*Rc; //power lost in current coil in W
e = (PL/P)*100; //percentage error in %
Pc = (V^2)/Rp; //power lost in presuure coil in W
e = (Pc/P)*100; //percentage error in %
P1 = V*I*y; //power input to the apparatus in W
PL1 = (I^2)*Rc; //power lost in current coil in W
e1 = (PL1/P1)*100; //percentage error in %
Pc1 = (V^2)/Rp; //power lost in presuure coil in W
e1 = (Pc1/P1)*100; //percentage error in %
//result
mprintf("percentage error when pf 1 lagging %3.2f percentage",e);
mprintf("\npercentage error when pf 0.4 lagging %3.2f percentage",e1);
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