noun

watt

WAHT/wɑːt/

The SI unit of power equal to one joule per second.

The heater uses one watt of power.

Two successive views of the same simple electrical heater and measuring instrument: its power stays at 1 W while its elapsed-time and delivered-energy counters advance from 0 s and 0 J to 1 s and 1 J.

Etymology

wattEnglishJames Watt, Scottish engineer

Watt is the surname of the engineer honored by the power unit's name. It was adopted as a practical unit of electrical power, turning a personal name into a technical measure.

In context

FuseSchool - Global Education0:28

a watt is a measure of power where one watt is equal to one joule per second so a 100 watt light bulb uses 100 joules of energy every second

Energy Use In Electrical Appliances | Energy | Physics | FuseSchool

More examples

The lamp used several watts.
She calculated the power in watts.
One watt equals one joule per second.

Forms

watt · watts

Similar words

joule: Measures energy rather than power.
kilowatt: One thousand watts.