Definition of alternating current in English:

alternating current

Line breaks: al¦ter|nat¦ing cur|rent
(abbreviation: AC or ac)


An electric current that reverses its direction many times a second at regular intervals, typically used in power supplies. Compare with direct current.
More example sentences
  • LED lights require a transformer to turn alternating current to direct current.
  • The company built a new mill and contracted with the Telluride Power and Transmission Company at Ames to supply electricity as an alternating current to both the mine and mill.
  • In any case Edison's technique was limited by his insistence on using direct current, rather than the standard alternating current that soon took its place when the advantages were recognized.

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