Final answer:
Alternating current (AC) regularly changes direction, while direct current (DC) flows in one direction only.
Explanation:
Alternating current (AC) is the term used for electric current that regularly reverses direction. It moves back and forth at regular intervals, as opposed to direct current (DC), which flows in only one direction without reversing. AC is commonly seen in commercial and residential power systems, where the current alternates between two polarities.
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