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Question

A wattmeter is connected as shown in below figure. Wattmeter has a current coil of 0.1Ω resistance. Percentage of error in reading of wattmeter when it is connected to a load of 12 A at 250 V with unity power factor is


A
0.52%
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B
0.48%
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C
0.32%
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D
0.64%
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Solution

The correct option is B 0.48%
Percentage error=I2RCVI cos ϕ

=(12)2×0.1250×12×1×100

=14.43000×100=0.48%

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