Why do we use wattmeter?
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The wattmeter is an instrument for measuring the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.
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the wattmeter is used by electricians and anyone in the electricity business to measure the amount of electricity being used.
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