Watt

The rate of energy transfer equivalent to one ampere under an electrical pressure of one volt. One watt equals 1/746 horsepower, or one joule per second. It is the product of Voltage and Current (amperage).

The common base unit of power in the metric system. One watt equals one joule per second. It is the power developed in a circuit by a current of one ampere flowing through a potential difference of one volt. One Watt = 3.413 Btu/hr.

Basic unit of electrical power produced at one time. One watt equals one joule per second. The power of a current of one ampere flowing across a potential difference of one volt. See kilowatt, megawatt, and gigawatt.

Unit of power in the MKS system of units; energy per unit of time, one Joule per second (1 J/s). Abbreviated W.