800w

800 W (800 watts) is a unit of power in the International System of Units (SI). A watt is defined as one joule of energy transferred per second, and the symbol for the unit is W. Thus, 800 W represents a rate of energy transfer of 800 joules every second.

In electrical terms, power is the product of voltage and current (P = V × I). The same power level can be delivered by different combinations of voltage and current, depending on the device and its circuitry. When a device is rated at 800 W, that figure describes its operating rate under specified conditions, typically the input power drawn from the supply or the usable output power, accounting for efficiency where relevant.

800 W is a common specification for household and industrial equipment. Examples include some heating elements, power supplies, and small motors. It is also a frequently cited reference point for comparing energy use: running an 800 W device for one hour consumes 0.8 kilowatt-hours (kWh) of energy.

The term can appear as "800W" in product labels, catalogs, or schematics, and may also be rounded in marketing materials to express power class. The 800 W rating is one element of a device’s overall performance, alongside efficiency, voltage, current, and duty cycle.

Related topics include the watt, kilowatt, electrical power, and energy units.