Definition
The SI unit of energy and work, defined as the energy transferred when one watt of power acts for one second. In power systems, joules appear less frequently than watt-hours, but the relationship is direct: one kilowatt-hour equals 3.6 million joules (3.6 MJ). Joules are the fundamental energy unit underlying both real power (watts = joules per second) and thermal energy conversions used in plant heat-rate and efficiency calculations.
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Topic Deck
Electrical Engineering Fundamentals
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Source
FERC Pro Forma OATT / LGIP