Watt
Symbol: W
The watt is a derived unit of power in the International System of Units (SI).
The unit is named after the Scottish inventor James Watt and it measures the rate of energy conversion.
By the definitions of electric potential (volt) and current (ampere), work is done at a rate of one watt when one ampere flows through a potential difference of one volt. 1 Watt = 1 Volt * 1 Ampere
In terms of mechanical energy, one watt is the rate at which work is done when an object is moved at a speed of one meter per second against a force of one newton.
1W = 1J/s