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alternating current
(Encyclopedia) alternating current, abbr. AC, a flow of electric charge that undergoes periodic reverses in direction. In North America ordinary household current alternates at a frequency of 60…wave, in physics
(Encyclopedia) wave, in physics, the transfer of energy by the regular vibration, or oscillatory motion, either of some material medium or by the variation in magnitude of the field vectors of an…Armageddon
(Encyclopedia) ArmageddonArmageddonärˌməgedˈən [key], in the New Testament, great battlefield where, at the end of the world, the powers of evil will fight the powers of good. If the usual etymology…hertz
(Encyclopedia) hertzhertzhûrts [key] [for Heinrich R. Hertz], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the…Percentage of Students Ages 9, 13, and 17, by Frequency of Reading for Fun
Age 9 Almost every day Once or twice a week Once or twice a month A few times a year…Arsonval, Arsène d'
(Encyclopedia) Arsonval, Arsène d'Arsonval, Arsène d'ärsĕnˈ därsôNvälˈ [key], 1851–1940, French physicist and physician. He worked under Claude Bernard and under C. E. Brown-Séquard (whom he…fireball
(Encyclopedia) fireball, very bright meteor leaving a trail in the sky that can remain visible for several minutes; often a distinct sound, perhaps caused by very low frequency radio waves, is…crossing over
(Encyclopedia) crossing over, process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis. At…sleep
(Encyclopedia) sleep, resting state in which an individual becomes relatively quiescent and relatively unaware of the environment. During sleep, which is in part a period of rest and relaxation, most…commutator
(Encyclopedia) commutator, device used in an electric generator to convert the alternating current produced in the generator into direct current before the current is sent into an external circuit;…Trending
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