watt
SayWOTUS/wɑt/UK/wɒt/
Pluralwatts
- 1In the International System of Units, the unit of power, equal to one joule of energy transferred per second; written with the symbol W.
The space heater draws 1,500 watts on its highest setting.
The small amplifier delivers just one watt per channel, enough for casual listening.
Note
A unit that honors a person, the Scottish engineer James Watt, which is why its symbol is a capital W while the word itself stays lowercase. Reduced to base units, it is a kilogram meter squared per second cubed. The distinction worth keeping is rate versus amount: the joule measures energy, and the watt measures how fast that energy moves. That is why a heater is rated in watts, not joules.
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Origin
The word comes from the name of the Scottish engineer James Watt.