What is unique about alternating current in terms of polarity?

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Multiple Choice

What is unique about alternating current in terms of polarity?

Explanation:
Polarity keeps changing in alternating current. The voltage swings from positive to negative and back again as the waveform cycles, so there’s no fixed direction of flow. In the United States, power is 60 cycles per second (60 Hz), so the signal repeats every 1/60 of a second. That means the polarity reverses as the wave goes through each half-cycle, which is why AC is described as changing polarity at a rate tied to the frequency. This is what sets AC apart from direct current, where the polarity stays the same.

Polarity keeps changing in alternating current. The voltage swings from positive to negative and back again as the waveform cycles, so there’s no fixed direction of flow. In the United States, power is 60 cycles per second (60 Hz), so the signal repeats every 1/60 of a second. That means the polarity reverses as the wave goes through each half-cycle, which is why AC is described as changing polarity at a rate tied to the frequency. This is what sets AC apart from direct current, where the polarity stays the same.

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