| 单词 | direct current |
| 释义 | > as lemmasdirect current direct current n. an electric current flowing in one direction only, as distinguished from an alternating current; abbrev. d.c., D.C.; also attributive. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > electric current > [noun] > direct direct current1889 1886 Jrnl. Soc. Telegraph-engineers & Electricians 15 193 I am glad that people are beginning to use the term ‘direct’ when they mean a current which does not alternate.] 1889 E. J. Houston Dict. Electr. Words 165 Direct current. 1893 D. C. Jackson Text-bk. Electro-magn. I. 92 A current constant in direction, but not necessarily so in value, is often called a Direct Current. 1893 Jrnl. Soc. Arts 41 623/2 The general merits of alternate-current, as against those of the direct-current systems. 1915 J. C. Hawkhead & H. M. Dowsett Handbk. Wireless Telegraphists (ed. 2) 83 A direct current may be passed through a known resistance and the amount of heat generated may be measured. 1959 Chambers's Encycl. XI. 547/2 The term rectifier is used of any electrical device which can convert an alternating current into a source of direct current. < as lemmas |
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