What type of power does AC represent?

Alternating current (AC) is characterized by the flow of electric charge that changes direction periodically. This means that the current moves back and forth rather than flowing in just one direction, which is a defining feature of AC. This behavior allows AC to efficiently transport electricity over long distances, making it a standard choice for power distribution systems around the world.

The other options refer to different concepts in electrical power. Direct current (DC) flows in a single direction and is typically used for batteries and electronics. Static power suggests a lack of current flow entirely, which does not apply to AC. Lastly, stored energy in a battery relates to potential energy, not the dynamic flow of electrons as seen in AC. Thus, the choice that best describes AC is the one that highlights its nature of moving in both directions.