| 单词 | DC (Direct Current) |
| 释义 | DC (Direct Current) The flow of electrons through a metallic circuit, with the direction of flow being from positive (+) pole to negative (–) pole. Direct current (DC) travels in one direction only, while alternating current (AC) travels in both directions across the circuit. A continuous flow of AC current travels first in one direction and then reverses polarity and flows in the opposite direction. See also AC, electromagnetic spectrum, Hz, and wavelength. |
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