Which statement best describes Direct Current?

Which statement best describes Direct Current?

• A. Current that only and always flows in one direction
• B. Current that changes direction periodically
• C. The unit of frequency
• D. The phenomenon of energy conversion

Answer: (A)

Direct current flows in only one direction; its polarity stays fixed and the current does not reverse course, even though its magnitude can vary. This is why the description “only and always flows in one direction” is the best fit for DC. In contrast, alternating current reverses direction periodically, which is not characteristic of direct current. The unit of frequency (hertz) and the general idea of energy conversion aren’t descriptions of the current’s direction, so they don’t define what direct current is. Batteries, DC power supplies, and solar cells produce direct current.

Direct current flows in only one direction; its polarity stays fixed and the current does not reverse course, even though its magnitude can vary. This is why the description “only and always flows in one direction” is the best fit for DC. In contrast, alternating current reverses direction periodically, which is not characteristic of direct current. The unit of frequency (hertz) and the general idea of energy conversion aren’t descriptions of the current’s direction, so they don’t define what direct current is. Batteries, DC power supplies, and solar cells produce direct current.