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HandWiki. Power. Encyclopedia. Available online: https://encyclopedia.pub/entry/31980 (accessed on 13 October 2026).
HandWiki. Power. Encyclopedia. Available at: https://encyclopedia.pub/entry/31980. Accessed October 13, 2026.
HandWiki. "Power" Encyclopedia, https://encyclopedia.pub/entry/31980 (accessed October 13, 2026).
HandWiki. (2022, October 31). Power. In Encyclopedia. https://encyclopedia.pub/entry/31980
HandWiki. "Power." Encyclopedia. Web. 31 October, 2022.
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In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity. Power is related to other quantities; for example, the power involved in moving a ground vehicle is the product of the traction force on the wheels and the velocity of the vehicle. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. Likewise, the power dissipated in an electrical element of a circuit is the product of the current flowing through the element and of the voltage across the element.
angular velocity
ground vehicle
voltage
References
- Burning coal produces around 15-30 megajoules per kilogram, while detonating TNT produces about 4.7 megajoules per kilogram. For the coal value, see Fisher, Juliya (2003). "Energy Density of Coal". The Physics Factbook. http://hypertextbook.com/facts/2003/JuliyaFisher.shtml. For the TNT value, see the article TNT equivalent. Neither value includes the weight of oxygen from the air used during combustion.
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