The definition of a watt is the basic unit of electric, mechanical or thermal power.
An example of a watt is a measure of a light bulb's power.
watt definition by Webster's New World
the basic unit of electric, mechanical, or thermal power in the SI and MKS systems, equal to one joule per second or 10 ergs per second ( of a horsepower): for electric power it is equal to one volt-ampere: abbrev. W
Origin: after James Watt: name proposed (1882) by Sir William Siemens
James 1736-1819; Scot. engineer & inventor: pioneer in the development of the steam engine
Watt is the fundamental unit of electrical power, and is a rate unit, rather than a quantity.The wattage is determined by multiplying the voltage (E), as measured in volts (V), by the current (I), as measured in amperes (A). (W = V
The standard unit of measurement of electrical power. One watt is one ampere of current flowing at one volt. Watts are typically rated as AMPS x VOLTS or VOLT-AMP (V-A). However, this rating is only equivalent to watts when it applies to devices that absorb all the energy, such as electric heating coils or incandescent light bulbs. With computer power supplies, the actual watt rating is only 60% to 70% of the VOLT-AMP rating.