Which type of current is abbreviated as AC?

The correct answer is Alternating Current, commonly abbreviated as AC. This type of current is characterized by the flow of electric charge that periodically reverses direction. In practical terms, this means that the electrical current changes its magnitude and direction in a cyclical manner, typically following a sinusoidal wave pattern.

Alternating Current is widely used in power supply systems because it can be transmitted over long distances with less energy loss compared to Direct Current (DC), which flows in one direction only. The use of transformers with AC allows for efficient voltage changes, making it suitable for various applications in homes and industries.

In contrast, the other options—such as Direct Current, which flows in a single direction, Static Current, which pertains to stationary electric charges, and Voltage Current, which is not a standard term in electrical engineering—do not describe the alternating nature of AC and thus are not correct in this context.