What term describes current that changes direction?

What term describes current that changes direction?

• A. Direct current
• B. Pulsating current
• C. Alternating current
• D. Capacitive current

Answer: (C)

The main idea is that current that changes direction over time is alternating current. In alternating current, the flow reverses its direction periodically, typically following a waveform like a sine wave, and the polarity flips at a regular frequency (for example, 50 or 60 Hz depending on the region). This is what makes it suitable for power distribution—voltage and current continually switch direction as the waveform cycles. In contrast, direct current flows in one direction only, with a constant polarity. A pulsating current might vary in magnitude but still moves in the same direction overall; it doesn’t reverse direction. Capacitive current refers to the current that charges and discharges a capacitor and can be part of AC behavior, but it isn’t defined by direction reversal itself. So, the term that describes current that changes direction is alternating current.

The main idea is that current that changes direction over time is alternating current. In alternating current, the flow reverses its direction periodically, typically following a waveform like a sine wave, and the polarity flips at a regular frequency (for example, 50 or 60 Hz depending on the region). This is what makes it suitable for power distribution—voltage and current continually switch direction as the waveform cycles.

In contrast, direct current flows in one direction only, with a constant polarity. A pulsating current might vary in magnitude but still moves in the same direction overall; it doesn’t reverse direction. Capacitive current refers to the current that charges and discharges a capacitor and can be part of AC behavior, but it isn’t defined by direction reversal itself.

So, the term that describes current that changes direction is alternating current.