What is AC current?

What is AC current?

• A. Alternating current; electrons flow first in one direction and then in the other
• B. Direct current; electrons flow in one direction
• C. Static electricity
• D. High voltage DC

Answer: (A)

Alternating current means the direction of the current reverses periodically. In a conductor, the electrons don’t just keep moving in one direction; instead they wiggle back and forth as the voltage from the source alternates. The result is that electrons flow first in one direction and then in the other, so over a full cycle there’s no long-term net drift even though energy is carried by the changing electric field. This is exactly what the description “Alternating current; electrons flow first in one direction and then in the other” conveys. Direct current would be electrons moving in one direction, which is not what’s happening here. Static electricity refers to a buildup of charge with little to no continuous current. High voltage DC is simply direct current at a higher voltage, not alternating.

Alternating current means the direction of the current reverses periodically. In a conductor, the electrons don’t just keep moving in one direction; instead they wiggle back and forth as the voltage from the source alternates. The result is that electrons flow first in one direction and then in the other, so over a full cycle there’s no long-term net drift even though energy is carried by the changing electric field. This is exactly what the description “Alternating current; electrons flow first in one direction and then in the other” conveys.

Direct current would be electrons moving in one direction, which is not what’s happening here. Static electricity refers to a buildup of charge with little to no continuous current. High voltage DC is simply direct current at a higher voltage, not alternating.