Final answer:
An alternating current (AC) is a current that varies in strength and swaps direction smoothly and regularly.
Step-by-step explanation:
An alternating current (AC) is a current that varies in strength and swaps direction smoothly and regularly. Unlike direct current (DC), which flows continuously in one direction, AC changes direction periodically. The most common example of AC is the electricity that is supplied to homes and buildings, which constantly changes direction.
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