What best describes Alternating Current (AC)?

What best describes Alternating Current (AC)?

• A. A flow of electric charge that moves only in one direction.
• B. A flow of electric charge that regularly reverses its direction.
• C. A flow of electrons that stops intermittently.
• D. A steady voltage without current.

Answer: (B)

Alternating current is the flow of electric charges that regularly reverses its direction. The voltage driving it changes polarity over time, so the current swings back and forth instead of moving steadily in one direction. This continual reversal is what lets power be easily transformed to different voltages and transmitted efficiently. It doesn’t stop; it crosses zero and continues to reverse each cycle. That distinguishes it from a steady flow of charge in one direction, which is direct current. The idea of a steady voltage with no current describes an open circuit, not AC.

Alternating current is the flow of electric charges that regularly reverses its direction. The voltage driving it changes polarity over time, so the current swings back and forth instead of moving steadily in one direction. This continual reversal is what lets power be easily transformed to different voltages and transmitted efficiently.

It doesn’t stop; it crosses zero and continues to reverse each cycle. That distinguishes it from a steady flow of charge in one direction, which is direct current. The idea of a steady voltage with no current describes an open circuit, not AC.