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//===========================================================================
//chapter 7 example 20
clc;
clear all;
//variable declaration
IPR = 8; //current in line R in A
IPY = 10; //current in line Y in A
IPB = 6; //current in line B in A
VP =120; //voltage in V
pf = 1; //power factor
//calculations
W1 = VP*IPR*pf; //wattage shown by wattmeter having current coil in line R in watts
W2 = VP*IPY*pf; //wattage shown by wattmeter having current coil in line Y in watts
W3 = VP*IPB*pf; //wattage shown by wattmeter having current coil in line B in watts
p = W1+W2+W3; //power taken by lighting load in watts
//result
mprintf("wattage shown by wattmeter having current coil in line R = %3.2f watts",W1);
mprintf("\nwattage shown by wattmeter having current coil in line Y = %3.2f watts",W2);
mprintf("\nwattage shown by wattmeter having current coil in line B = %3.2f watts",W3);
mprintf("\npower taken by lighting load = %3.2f watts",p);
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