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Describe the working principle of wattmeter

Answer 

The current coils is connected in series with the line, and the voltage coil is connected across the line, both coils are wound on a metal frame of special design provided two magnetic circuit. A light aluminium disk is suspended in the air gap of the current to flow in the disk. The reaction of the voltage coil creates a torque [motor action] on the disk, causing it to rotate. The developed torque is proportional to the field strength of the voltage coil and the eddy current.

Oluwamuyide Peter

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