Alternating current is best described as which of the following?

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Multiple Choice

Alternating current is best described as which of the following?

Explanation:
Alternating current is a current that periodically reverses direction. The flow of electrons swings back and forth, usually in a smooth, repeating pattern, so the current changes direction many times per second. This is what sets AC apart from direct current, which always flows in the same direction. The “periodically reverses direction” description captures the essence of AC. The other ideas don’t fit: unidirectional flow describes DC, zero flow would mean no current at all, and the notion that AC never exists is false because electricity in homes and grids is AC.

Alternating current is a current that periodically reverses direction. The flow of electrons swings back and forth, usually in a smooth, repeating pattern, so the current changes direction many times per second. This is what sets AC apart from direct current, which always flows in the same direction. The “periodically reverses direction” description captures the essence of AC. The other ideas don’t fit: unidirectional flow describes DC, zero flow would mean no current at all, and the notion that AC never exists is false because electricity in homes and grids is AC.

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