wattmeter

[wot-mee-ter]
noun Electricity.
a calibrated instrument for measuring electric power in watts.

Origin:
1885–90; watt + -meter

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World English Dictionary
wattmeter (ˈwɒtˌmiːtə)
 
n
a meter for measuring electric power in watts

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Heaters shall be connected to an electrical supply circuit of nameplate voltage with a wattmeter installed in the circuit.
Automatic dimming and/or switching can be verified with a temporary wattmeter on the electric lighting circuits.
Then, although the unit wattmeter makes a visible swing, it and the currents and stresses are still well within normal range.
Connects appliance to power source and test meters such as wattmeter, ammeter, or voltmeter.
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