ampere

ampere
The practical unit of electrical current; the absolute, practical a. originally was defined as having the value of 110 of the electromagnetic unit (see abampere and coulomb). Present definitions are: 1. The practical unit of electrical current; the absolute, practical a. originally was defined as having the value of 110 of the electromagnetic unit (see abampere and coulomb). 2. Legal definition : the current that, flowing for 1 second, will deposit 1.118 mg of silver from silver nitrate solution. 3. Scientific (SI) definition : the current that, if maintained in two straight parallel conductors of infinite length and of negligible circular cross-sections and placed 1 m apart in a vacuum, produces between them a force of 2 × 10−7 N/m of length. [A. Ampère]

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am·pere 'am-.pi(ə)ralso -.pe(ə)r n
1) the practical mks unit of electric current that is equivalent to a flow of one coulomb per second or to the steady current produced by one volt applied across a resistance of one ohm
2) the base unit of electric current in the International System of Units that is equal to a constant current which when maintained in two straight parallel conductors of infinite length and negligible circular sections one meter apart in a vacuum produces between the conductors a force equal to 2 × 10-7 newton per meter of length
Am·père än-per André Marie (1775-1836)
French physicist. Ampère is credited with founding, naming, and developing the science of electrodynamics. He was the formulator of two laws in electromagnetism relating magnetic fields to electric currents. The first person to develop techniques for measuring electricity, he invented an instrument that was a forerunner of the galvanometer. In 1881 at the suggestion of Sir Charles Bright, an international congress on electricity adopted ampere as a term for the standard unit of electric current.

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n.
the basic SI units of electric current. It is equal to the current flowing through a conductor of resistance 1 ohm when a potential difference of 1 volt is applied between its ends. The formal definition of the ampere is the current that when passed through two parallel conductors of infinite length and negligible cross section, placed 1 metre apart in a vacuum, produces a force of 2 x 10-7 newton per metre between them. Symbol: A.

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am·pere (A) (amґpēr) [Andrй M. Ampиre, 1775–1836] the base SI unit of electric current, defined as the constant current that if maintained in two parallel straight conductors (of infinite length and negligible circular cross section) separated by a distance of 1 meter in a vacuum, produces a force between the conductors of 2 Ч10−7 newton per meter of length; it is equivalent to one coulomb per second. Formerly abbreviated amp.

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  • ampère — [ ɑ̃pɛr ] n. m. • 1865; de Ampère, nom d un physicien ♦ Unité d intensité des courants électriques, qui correspond à un écoulement de un coulomb par seconde dans un conducteur (symb. A). Ampère par mètre (symb. A/m) :unité d intensité de champ… …   Encyclopédie Universelle

  • AMPÈRE (A.-M.) — Dans l’effort continu de l’homme pour dominer la matière, capter son énergie, interpréter ses manifestations et les utiliser, des noms illustres émergent à qui nous sommes redevables de toute cette transformation. Dans la multitude de savants,… …   Encyclopédie Universelle

  • Ampere — Ampère Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Ampère peut désigner : André Marie Ampère (1775 1836), physicien français. Son nom a été donné à : l’ampère, unité SI d’intensité d’un… …   Wikipédia en Français

  • Ampere —     André Marie Ampère     † Catholic Encyclopedia ► André Marie Ampère     Physicist and mathematician, b. 22 January, 1775, at Lyons, France; d. at Marseilles, 10 June, 1836. His father was a prosperous and educated merchant, his mother… …   Catholic encyclopedia

  • Ampère — can refer to: *Ampère (car) *Ampere (unit) *André Marie Ampère, one of the main discoverers of electromagnetism *Ampere (band) …   Wikipedia

  • Ampère — ampere (de «A. M. Ampère», físico francés) m. Fís. Amperio, en la nomenclatura internacional. * * * ampere. (De A. M. Ampère, 1775 1836, matemático y físico francés). m. Fís. amperio. * * * …   Enciclopedia Universal

  • Ampère — (Париж,Франция) Категория отеля: 4 звездочный отель Адрес: 102 Avenue de Villiers, 17 й округ …   Каталог отелей

  • Ampère — (spr. angpǟr ), 1) André Marie, Physiker und Mathematiker, geb. 22. Jan. 1775 in Lyon, gest. 10. Juni 1836 in Marseille, studierte Chemie und Physik, erhielt 1801 eine Professur in Bourg, ging von dort nach Lyon und 1805 nach Paris und ward 1809… …   Meyers Großes Konversations-Lexikon

  • ampere — (de «A. M. Ampère», físico francés) m. Fís. Amperio, en la nomenclatura internacional. * * * ampere. (De A. M. Ampère, 1775 1836, matemático y físico francés). m. Fís. amperio. * * * ► masculino METR …   Enciclopedia Universal

  • ampere — (n.) 1881, the current that one volt can send through one ohm, from Fr. ampère, named for French physicist André Marie Ampère (1775 1836). Shortened form amp is attested from 1886 …   Etymology dictionary

  • Ampere — Am p[ e]re ([aum]N p[^a]r ), Ampere Am*pere ([a^]m*p[=a]r ), n. [From the name of a French electrician.] (Elec.) The unit of electric current; defined by the International Electrical Congress in 1893 and by U. S. Statute as, one tenth of the unit …   The Collaborative International Dictionary of English

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