AC is an abbreviation for which of the following?

AC stands for Alternating Current, which is a type of electrical current where the flow of electric charge periodically reverses direction. This is in contrast to direct current (DC), where the flow of electric charge is in a constant direction.

Alternating current is widely used in power systems and electrical appliances because it can be easily transformed to different voltage levels, making it efficient for long-distance transmission. The frequency of the current in alternating current systems is typically measured in hertz (Hz), indicating how many cycles of current occur in one second.

This distinction is fundamentally important for understanding electrical systems, as it relates to how electrical energy is generated, transmitted, and utilized in everyday devices.