alternating current

noun

: an electric current that reverses its direction at regularly recurring intervals
abbreviation AC

Examples of alternating current in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The researchers only needed alternating current circuits for this. Manon Bischoff, Scientific American, 12 May 2025 His vision for alternating current (AC) electricity was met with resistance and skepticism, even from industry giants like Thomas Edison. Glenn Llopis, Forbes.com, 24 May 2025 Once sufficient plants are online, a small subset of the grid will be powered, and the plants can manage the synchronization of their alternating current outputs to a single frequency. John Timmer, ArsTechnica, 28 Apr. 2025 But solar panels produce direct current, with electronic systems matching it to the alternating current of the grid. John Timmer, ArsTechnica, 28 Apr. 2025 See All Example Sentences for alternating current

Word History

First Known Use

1833, in the meaning defined above

Time Traveler
The first known use of alternating current was in 1833

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Cite this Entry

“Alternating current.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alternating%20current. Accessed 3 Jun. 2025.

Kids Definition

alternating current

noun
: an electric current that reverses its direction at regular intervals
abbreviation AC

More from Merriam-Webster on alternating current

Last Updated: - Updated example sentences
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