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direct current
electronics
- Abbreviation:
- DC
- Key People:
- Rookes Evelyn Bell Crompton
- Related Topics:
- electric current
- direct-current circuit
- On the Web:
- OpenStax - College Physics 2e - Alternating Current versus Direct Current (Nov. 20, 2024)
direct current, flow of electric charge that does not change direction. Direct current is produced by batteries, fuel cells, rectifiers, and generators with commutators. Direct current was supplanted by alternating current (AC) for common commercial power in the late 1880s because it was then uneconomical to transform it to the high voltages needed for long-distance transmission. Techniques that were developed in the 1960s overcame this obstacle, and direct current is now transmitted over very long distances, even though it must ordinarily be converted to alternating current for final distribution. For some uses, such as electroplating, direct current is essential. See also electric current.