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11 sectionsContents
- History
- Electrodynamic
- Electronic
- Digital
- Precision and accuracy
- Radio frequency
- Watthour meters
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thumb|upright|Wattmeter
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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