joule (J) joule (#) Fr.: joule A unit of → energy in the → International System of Units equal to the → work performed by one → newton over a distance of 1 → meter. 1 J is equivalent to 10^{7} ergs = 1 Watt second = 2.78 × 10^{-7} kWh = 0.2389 calories = 6.24 × 10^{18} eV. In honor of the English physicist James Prescott Joule (1818-1889), who established that the various forms of energy (mechanical, electrical, and heat) are basically the same and can be changed, one into another. Joule is in Pers. pronounced as žul, loaned from the Fr. rendering of the E. name. |
Joule effect oskar-e Joule Fr.: effet Joule A → conductor becomes heated by the passage of an electric current through it due to the → resistance of the conductor. Same as → Ohmic dissipation. |
Joule's constant pâyâ-ye Joule (#) Fr.: constante de Joule The proportional relationship of mechanical energy to thermal energy, equal to 4.184 joules per calorie. Also called mechanical equivalent of heat. |
Joule-Thomson effect oskar-e Joule-Thomson Fr.: effet Joule-Thomson The change in the temperature of a gas in the → throttling process. |