a switch or key for reversing the direction of an electric current by reversing the polarity of the voltage source.
| 单词 | θ77209 |
| 释义 | the world > matter > physics > electromagnetic radiation > electricity > electric current > alternating current > [noun] > change of direction > switch enabling (1) pole-changer1839 a switch or key for reversing the direction of an electric current by reversing the polarity of the voltage source. |
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