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单词 alternating voltage
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alternating voltage
b. Of an electric current: reversing direction at regular short intervals (many times a second), usually sinusoidally; (of a voltage) reversing phase similarly. Chiefly in alternating current, alternating voltage. Cf. a.c. n. at A n. Initialisms.
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the world > matter > physics > electromagnetic radiation > electricity > electric current > alternating current > [noun]
alternating current1833
alternate current1846
1833 Dublin Jrnl. Med. & Chem. Sci. 3 267 There is no perceivable difference whether we employ the current which always takes place in the same direction, or the alternating current.
1879 J. Tyndall Fragm. Sci. (1889) II. 428 M. Serrin modified his excellent lamp with the express view of enabling it to cope with alternating currents.
1884 F. Krohn tr. G. Glaser de Cew Magneto- & Dynamo-electr. Machines 249 The Ferranti alternating current generator.
1936 E. A. Atkins & A. G. Walker Electr. Arc & Oxy-acetylene Welding (ed. 3) 355 In this process, molecular hydrogen passing through an alternating arc between two tungsten wires is split up into atomic hydrogen.
1962 A. Lytel Industr. Electronics ii. 38 These rectifiers..are used in power supplies to rectify or convert alternating current to direct current.
1992 Consumer Rep. Oct. 669/1 A dimmer control lowers the voltage to a light bulb by interrupting portions of each cycle of alternating voltage.
2001 S. Roaf et al. Ecohouse (2002) viii. 194 True alternating current, as produced by the electricity industry or the rotary inverter, has a smooth waveform.
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