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Using Lenz's Law

A dynamometer...

Question

A dynamometer type wattmeter responds to the

A

average value of active power

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B

average value of reactive power

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C

peak value of active power

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D

peak value of reactive power

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Solution

The correct option is A average value of active power
$T_{D} \propto V I c o s ϕ (A c t i v e p o w e r)$
Average is taken over a period.

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