Question

A dynamometer wattmeter is rated at 10a and 100v with a full scale reading of 1000 w. The inductance of the voltage circuit is 5mh and its resistance 3000 ohm. Voltage across the current coil is negligible. At 50 hz and zero power factors, the error in the wattmeter at the va reading will be?

Answer 1

Answer:

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Answer 2

Explanation:

My answer 0.523 VA

Given cos

$cos( \alpha ) = 0$

$\sin( \alpha ) = 1$

$\tan( \beta ) = 1$