What term describes current that flows in only one direction and is also called direct current?

• A. Unidirectional current
• B. Alternating current
• C. Pulsating current
• D. AC current

Answer: (A)

One-way flow is the main idea here. Current that moves in a single direction is described as unidirectional, which aligns with the concept of direct current that keeps the same direction over time. Among the options, unidirectional current directly signals that one-direction movement. Alternating current reverses direction, so it doesn’t fit. Pulsating current describes a DC that varies in magnitude but generally keeps the same direction, so it’s not as precise for emphasizing one-direction flow. AC current is just another term for alternating current, which involves direction changes.