If current flows in one direction, which type of current is this?

If current flows in one direction, which type of current is this?

• A. Alternating current (AC)
• B. Pulsating current
• C. Variable current
• D. Direct current (DC)

Answer: (D)

Direct current is current that flows in a single, fixed direction. This is what you get from a battery or a DC power supply. Alternating current changes direction periodically, so it doesn’t maintain one direction over time. Pulsating current may vary in magnitude but still moves in the same direction, which is why it’s considered a form of unidirectional current, but the classic, simplest label for a unidirectional flow is direct current.

Direct current is current that flows in a single, fixed direction. This is what you get from a battery or a DC power supply. Alternating current changes direction periodically, so it doesn’t maintain one direction over time. Pulsating current may vary in magnitude but still moves in the same direction, which is why it’s considered a form of unidirectional current, but the classic, simplest label for a unidirectional flow is direct current.