alternating current

Also known as AC, AC current

electric current which periodically reverses direction

AI overview

Alternating current is electric current that regularly switches direction back and forth, rather than flowing in one constant direction. This type of current is widely used because it can be efficiently transmitted over long distances and easily converted to different voltage levels, making it practical for powering homes and businesses.

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Commons category: Alternating current

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Alternating current (green curve). The horizontal axis measures time (it also represents zero voltage/current); the vertical, current or voltage.

Alternating current (AC) is an electric current that periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. The abbreviations AC and DC are often used to mean simply alternating and direct, respectively, as when they modify current or voltage.