What is Direct Current (DC)?

What is Direct Current (DC)?

• A. Alternating current that reverses direction
• B. Direct Current, a current that can only travel in one direction
• C. Pulsating current
• D. Random current

Answer: (B)

Direct current means electric charge flows in a single, fixed direction through a conductor. In a DC source like a battery or a DC power supply, the electrons drift toward one terminal, so the current has a constant direction (and typically a stable magnitude). This is what sets DC apart from alternating current, where the direction of flow reverses periodically. That unidirectional flow is the essence here, making the description of a current that can only travel in one direction the best match. A pulsating current can still move in the same direction but varies in magnitude; a random current lacks a well-defined direction, and the term oscillating refers to reversal of direction.

Direct current means electric charge flows in a single, fixed direction through a conductor. In a DC source like a battery or a DC power supply, the electrons drift toward one terminal, so the current has a constant direction (and typically a stable magnitude). This is what sets DC apart from alternating current, where the direction of flow reverses periodically. That unidirectional flow is the essence here, making the description of a current that can only travel in one direction the best match. A pulsating current can still move in the same direction but varies in magnitude; a random current lacks a well-defined direction, and the term oscillating refers to reversal of direction.