What term describes current that flows in only one direction?

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

Answer: (A)

Direct current describes current that flows in only one direction. In this mode, electrons move steadily toward the same direction, as with batteries and DC power supplies. This stands in contrast to alternating current, where the flow reverses direction periodically—like the electricity from household outlets. Some signals may be pulsating DC, where the magnitude changes but the direction remains the same, but the term that captures unidirectional flow is direct current.