Last modified on June 27, 2016, at 23:05


The watt is the ISU unit for power. It is defined as one joule of energy per second.

In terms of electromagnetism, one watt is the rate at which work is done when one ampere (A) of current flows through an electrical potential difference of one volt (V).

The unit was named after the Scottish engineer James Watt (1736–1819).