| 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. |