What characterizes D.C. current?

Direct current (D.C.) is characterized by the flow of electric charge in one direction. This unidirectional flow means that the current does not switch back and forth but instead maintains a constant polarity, which leads to a stable and controllable energy supply in various applications.

While D.C. can be produced with a constant voltage source, the key feature that distinguishes it from other forms of current, particularly alternating current (A.C.), is its one-directional flow. In contrast, options that suggest periodic changes in direction or limit the current's usability to specific components, such as capacitors, do not accurately define the characteristics of D.C. current. Thus, the defining characteristic of D.C. is its ability to consistently move electric charge in a single directional flow.