Which term describes current that always flows in one direction?

• A. Alternating Current (AC)
• B. Frequency
• C. Direct Current (DC)
• D. Hertz

Answer: (C)

Direct current is the type of current that keeps its flow in one direction. In DC, electrons move steadily in a single direction, such as what you get from a battery. Alternating current, by contrast, reverses direction periodically, which is why it’s called alternating current. The term frequency—or its unit, Hertz—describes how often those direction changes occur each second, not a constant one-way flow. So DC best fits the description of current that always flows in one direction.