lightning
electric current electric current, electrical current electrical current, the movement of electrically charged particles, atoms, or ions, through solids, liquids, gases, or free space; the term is usually used of relatively smooth movements of electric charge through conductors, whether constant or variable. Sudden movements of charge are usually referred to by other terms, such as {spark} or {lightning} or {discharge}. In metallic conductors the electric current is usually due to movement of electrons through the metal. The current is measured as the rate of movement of charge per unit time, and is counted in units of amperes. As a formal definition, the direction of movement of electric current is considered as the same as the direction of movement of positive charge, or in a direction opposite to the movement of negative charge. Electric current may move constantly in a single direction, called {direct current} (abbreviated {DC}), or may move alternately in one direction and then the opposite direction, called {alternating current} (abbreviated {AC}). [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Lightning — Light ning (l[imac]t n[i^]ng), n. [For lightening, fr. lighten to flash.] 1. A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound… …   The Collaborative International Dictionary of English

  • Lightning — (engl. für Blitz) ist der Name für: Lockheed P 38, Lightning, ein US amerikanisches Jagdflugzeug des Zweiten Weltkriegs English Electric Lightning, einen britischen Abfangjäger der 1960er Jahre Lockheed Martin F 35 Lightning II, ein in… …   Deutsch Wikipedia

  • lightning — lightning, lightening Lightning is the spelling with reference to electrical flashes in the sky (thunder and lightning), whereas lightening is a form of the verb lighten • (I welcome the lightening of this burden that s imposed on councils… …   Modern English usage

  • lightning — late 13c., prp. of lightnen make bright, extended form of O.E. lihting, from leht (see LIGHT (Cf. light) (n.)). Meaning cheap, raw whiskey is attested from 1781, also sometimes gin. Lightning bug is attested from 1778. Lightning rod from 1790 …   Etymology dictionary

  • lightning — ► NOUN 1) the occurrence of a high voltage electrical discharge between a cloud and the ground or within a cloud, accompanied by a bright flash. 2) (before another noun ) very quick: lightning speed. ORIGIN from LIGHTEN(Cf. ↑lighten) …   English terms dictionary

  • lightning — [līt′niŋ] n. [ME lightninge < lightnen, to LIGHTEN1] 1. a flash of light in the sky caused by the discharge of atmospheric electricity from one cloud to another or between a cloud and the earth 2. such a discharge of electricity vi. to give… …   English World dictionary

  • Lightning — Light ning (l[imac]t n[i^]ng), vb. n. Lightening. [R.] [1913 Webster] …   The Collaborative International Dictionary of English

  • Lightning — This article is about the atmospheric electrical phenomenon. For other uses, see Lightning (disambiguation). See also: Lightning strike Lightning striking Atlanta, United States Lightning is an atmospheric electrostatic discharge (spar …   Wikipedia

  • Lightning — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sur les autres projets Wikimedia : « Lightning », sur le Wiktionnaire (dictionnaire universel) Lightning signifie « éclair » en… …   Wikipédia en Français

  • lightning — /luyt ning/, n., v., lightninged, lightning, adj. n. 1. a brilliant electric spark discharge in the atmosphere, occurring within a thundercloud, between clouds, or between a cloud and the ground. v.i. 2. to emit a flash or flashes of lightning… …   Universalium

  • lightning — {{Roman}}I.{{/Roman}} noun ADJECTIVE ▪ ball, forked, sheet ▪ Forked lightning flickered across the sky. ▪ heat (esp. AmE) ▪ greased (figura …   Collocations dictionary

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