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Explain in detail about construction woking of single phase wattmeter?

Theresa Perry

in Higher Education

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Nicholas Rivera on April 8, 2018

Wattmeter Definition The wattmeter is an instrument for measuring the electric power (or the supply rate of electrical energy) in watts of any given circuit.Electric power is measured by means of a wattmeter. This instrument is of the electrodynamic type. It consists of a pair of coils fixed, known as current coils, and a movable coil known as the potential coil. The fixed coils are made of a few turns of a relatively large conductor. The potential coil consists of many turns of fine wire. It is mounted on a shaft, carried in jeweled bearings so that it can rotate in the interior of the coil stationary. The movable coil carries a needle that moves over a suitably marked scale. Spiral coil springs hold the needle to the zero position.The following figure shows the circuit of a simple wattmeter.


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