Which phrase best describes direct current?

Which phrase best describes direct current?

• A. Produced by chemical means
• B. Alternates direction of flow
• C. Flows in a circular path
• D. Generated by mechanical motion

Answer: (A)

Direct current flows in a single direction, and in everyday electrical sources it is typically produced by chemical reactions, as in batteries. That connection to chemical means makes it the best description among the options. The other statements describe aspects not specific to DC: alternating direction of flow refers to alternating current; current can flow in a closed loop in any complete circuit, which isn’t unique to DC; and generation by mechanical motion could refer to a generator and isn’t exclusive to direct current since generators can produce either AC or DC depending on design.

Direct current flows in a single direction, and in everyday electrical sources it is typically produced by chemical reactions, as in batteries. That connection to chemical means makes it the best description among the options. The other statements describe aspects not specific to DC: alternating direction of flow refers to alternating current; current can flow in a closed loop in any complete circuit, which isn’t unique to DC; and generation by mechanical motion could refer to a generator and isn’t exclusive to direct current since generators can produce either AC or DC depending on design.