Power is not energy

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For other types of power, see Power (disambiguation).

Common symbol(s):	P
SI unit:	watt

Classical mechanics
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Core topics[show] Rigid body (dynamics Euler's equations) Motion (linear) Euler's laws of motion Newton's laws of motion Newton's law of universal gravitation Equations of motion Inertial / Non-inertial reference frame Fictitious force Mechanics of planar particle motion Displacement (vector) Relative velocity Friction Simple harmonic motion Harmonic oscillator Vibration Damping (ratio)
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In physics, power is the rate at which energy is transferred, used, or transformed. The unit of power is the joule per second (J/s), known as the watt (in honor of James Watt, the eighteenth-century developer of the steam engine). For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts—the more wattage, the more power, or equivalently the more electrical energy is used per unit time.^[1][2]
Energy transfer can be used to do work, so power is also the rate at which this work is performed. The same amount of work is done when carrying a load up a flight of stairs whether the person carrying it walks or runs, but more power is expended during the running because the work is done in a shorter amount of time. The output power of an electric motor is the product of the torque the motor generates and the angular velocity of its output shaft. The power expended to move a vehicle is the product of the traction force of the wheels and the velocity of the vehicle.
The integral of power over time defines the work