- James Prescott,1818–89, English physicist.
- the derived SI unit of work or energy; the work done when the point of application of a force of 1 newton is displaced through a distance of 1 metre in the direction of the force. 1 joule is equivalent to 1 watt-second, 10 7 ergs, 0.2390 calories, or 0.738 foot-poundSymbol: J
- James Prescott. 1818–89, English physicist, who evaluated the mechanical equivalent of heat and contributed to the study of heat and electricity
unit of electrical energy, 1882, coined in recognition of British physicist James P. Joule (1818-1889).
- The International System unit of electrical, mechanical, and thermal energy.
- A unit of electrical energy equal to the work done when a current of 1 ampere is passed through a resistance of 1 ohm for 1 second.
- A unit of energy equal to the work done when a force of 1 newton acts through a distance of 1 meter.
- British physicist who demonstrated that heat is a form of energy. His work established the law of conservation of energy, stating that energy is never destroyed but may be converted from one form into another. The joule unit of energy is named for him.
- The SI derived unit used to measure energy or work. One joule is equal to the energy used to accelerate a body with a mass of one kilogram using one newton of force over a distance of one meter. One joule is also equivalent to one watt-second.