What type of current flows steadily in one direction?

Direct current is the type of current that flows steadily in one direction. This characteristic means that the electric charge moves consistently from the negative terminal to the positive terminal of a power source. In practical terms, direct current is typically generated by sources such as batteries or solar cells and is used in various applications that require a stable and constant voltage supply.

In contrast, alternating current (AC) changes direction periodically, meaning the voltage and current fluctuate, typically following a sinusoidal pattern. Variable current involves fluctuations in magnitude or direction and can refer to any current that does not remain constant. Pulsating current, on the other hand, refers to direct current that is not smooth and contains sudden changes in the current level. Such variations can lead to inconsistencies in the flow of electricity. This distinction highlights why direct current is defined specifically by its steady, unidirectional flow, setting it apart from the other types of current mentioned.