Power (physics)

Power is the rate at which energy is transferred or work is done. It measures how quickly energy changes form or moves between systems.

Work (physics): Work is energy transferred when a force causes displacement along its direction. Mechanical power is the rate at which work is done.
Rate (mathematics): A rate expresses how one quantity changes relative to another, often over time. Power is an energy-change rate with respect to time.
Electrical power: Electrical power is the rate at which electrical energy is transferred or converted in a circuit. It applies the general rate definition to voltage and current.
Impulse: Impulse is the change in momentum produced by a force over a time interval. Impulse accumulates force over time, whereas power measures energy transfer per time.
Energy: Energy is a conserved physical quantity that can be transferred or transformed and measured in joules. Power quantifies the rate of energy transfer.
Joule: The joule is the SI unit of energy and work. Energy per second gives power when energy is measured in joules.
Power-to-weight ratio: Power-to-weight ratio is an object's power output divided by its mass or weight. It compares how much power machines provide for their size.
Pressure: Pressure is force exerted per unit area. Despite the shared word, pressure and power describe different physical quantities.
Force: Force is an interaction that changes an object's motion or shape. For motion under a force, power depends on force and velocity.
Second: The second is the SI base unit of time. Power's denominator is elapsed time measured in seconds.

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