Watt
The SI unit of power, equal to one joule of energy transferred per second. It measures the rate at which energy is transferred or converted.
Power (physics): The rate at which energy is transferred, transformed, or used. A watt is the SI unit used to quantify this physical quantity.
Dimensional analysis: A method that uses physical dimensions to check equations and derive relationships. Its dimensions derive the watt as mass times length squared per time cubed.
Kilowatt-hour: A unit of energy equal to one kilowatt of power sustained for one hour. It records energy consumption, unlike the watt, which measures power.
James Watt: A Scottish inventor and mechanical engineer associated with major improvements to the steam engine. The unit was named in his honor for his contributions to steam power.
Joule: The SI unit of energy, work, and heat. One joule transferred in one second is one watt.
Newton (unit): The SI unit of force, equal to one kilogram metre per second squared. Multiplying a newton by a metre per second gives one watt.
Electrical power: The rate at which electrical energy is transferred or converted in a circuit. Electrical devices commonly state their power ratings in watts.
International System of Units: The internationally agreed system of measurement units, abbreviated SI. The watt is the SI derived unit for power.
Second: The SI base unit of time, defined by a specified cesium-133 atomic transition. The watt divides an amount of energy by elapsed time.
Metre: The SI base unit of length, defined through the speed of light. The watt’s mechanical expression includes metres through work and force.