AC: meaning, definitions and examples

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AC

 

[ ˌeɪˈsi ]

Noun
Context #1 | Noun

abbreviation

AC is an abbreviation for alternating current, which refers to the flow of electric charge that periodically reverses direction. It is commonly used in power supplies and electrical appliances.

Synonyms

alternating current

Examples of usage

  • The lights flicker because the AC is unstable.
  • Many homes use AC for their electrical systems.
  • An AC motor converts electrical energy into mechanical energy.
Context #2 | Noun

realm

AC can also refer to air conditioning, which is a system or process for controlling the temperature and humidity in an indoor environment, typically by cooling the air.

Synonyms

air conditioning

Examples of usage

  • The AC in the car is not working properly.
  • We installed a new AC unit in our office.
  • She prefers a cool room, so the AC is always on.

Word origin

The term 'AC' originated in the late 19th century during the development of electrical engineering. The concept of alternating current was first extensively researched by Nikola Tesla and was a key component in the rise of the electrical age. Instead of relying on direct current (DC), which flows in only one direction, AC allowed for the transmission of electricity over long distances and made it possible to harness electrical power for various applications. The widespread adoption of AC during the War of Currents, where Tesla's AC system competed against Thomas Edison's DC system, led to its dominance in the electrical grid. The abbreviation 'AC' became standard in technical jargon, making it easily recognizable and widely used in discussions about electricity.