| 单词 | pole-changer |
| 释义 | > as lemmaspole-changer pole-changer n. a switch or key for reversing the direction of an electric current by reversing the polarity of the voltage source. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > electric current > alternating current > [noun] > change of direction > switch enabling pole-changer1839 1839 C. G. Page in Ann. Electr., Magnetism, & Chem. 3 389 The alternating currents, from the semi-revolutions of the armatures, are converted into a current of the same direction, by the application of my pole changer. 2001 Products Finishing (Nexis) 1 July 106 These air-cooled or water-cooled units can be equipped with optional amp-hr meter totalizer and preset counters, digital timers, over and under voltage alarms and pole-changers. < as lemmas |
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