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The unit of measurement of power, as well as heat flow, sound energy flow, DC power, active and full AC power, radiation flux and ionizing radiation energy flux in the International System of Units (SI).

The unit is named after the Scottish-Irish mechanical inventor James Watt, the creator of the universal steam engine. In accordance with the SI rules concerning derived units named after scientists, the name of the unitwattit is written with a lowercase letter, and its designation is capitalized.

The watt as a unit of power measurement was first adopted at the Second Congress of the British Scientific Association in 1882.  Prior to that, most calculations used the horsepower introduced by James Watt, as well as foot-pounds per minute.

The watt was introduced into the International System of Units (SI) by the decision of the XI General Conference on Weights and Measures in 1960 simultaneously with the adoption of the SI system as a whole.

One of the main characteristics of all electrical appliances is the power consumption, so on any electrical appliance (or in the instructions for it) you can find information about this power, expressed in watts.