Definition
The SI unit of real (active) power, equal to one joule per second — the rate at which energy is transferred or consumed. One watt represents the power dissipated when one ampere of current flows across a potential difference of one volt. In bulk transmission, individual watts are rarely used directly; instead, power is expressed in kilowatts (kW), megawatts (MW), or gigawatts (GW). Understanding the watt as the base unit clarifies that power is an instantaneous rate, distinct from energy measured in watt-hours or kilowatt-hours.
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Topic Deck
Electrical Engineering Fundamentals
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Source
FERC Pro Forma OATT / LGIP