What is the difference between AC and DC current?

The correct distinction between AC (Alternating Current) and DC (Direct Current) is that AC changes direction periodically while DC flows in one direction.

AC current is characterized by its periodic oscillation, allowing it to flow alternately in both directions. This property makes AC suitable for power distribution in homes and businesses since it can be easily transformed to different voltage levels and is more efficient over long distances.

In contrast, DC current maintains a constant flow in a single direction. It is typically used in low-voltage applications, such as batteries and electronic devices, where a stable and consistent voltage level is necessary.

This understanding is critical when considering the applications of these types of currents, especially in AV systems, where both AC and DC are utilized depending on the equipment and requirements for power supply.