Estimate the percentage error in the wattmeter reading

Posted on 2014-02-21 15:36:00 in Physics by DYNAMO

An electro dynamic wattmeter has a voltage circuit of resistance of 8000 ? and inductance of 63.6 mH which is connected directly across a load carrying a current of 8 A at a 50 Hz voltage of 240.V and p.f of 0.1 lagging. Estimate the percentage error in the wattmeter reading caused by the loading and inductance of the voltage circuit.

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