What does the abbreviation AC stand for in relation to electrical circuits?

The abbreviation 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 electric charge flows in a single direction. Alternating current is commonly used in power supply systems because it allows for efficient transmission of electricity over long distances. The ability to easily transform AC voltages using transformers makes it practical for utilization in residential and industrial electrical systems.

In addition to the correct answer, other options like Ampere Current, Active Circuit, and Automatic Charge do not accurately reflect the established terminology in electrical engineering. Ampere is a unit of electric current rather than a type of current, Active Circuit does not define a specific type of current, and Automatic Charge is not a recognized term in this context.