What is one characteristic of direct current (DC)?

Direct current (DC) is defined by the fact that it flows in one direction only. This characteristic distinguishes it from alternating current (AC), where the current periodically changes direction. In a DC circuit, the electrons move steadily in the same direction, which allows for stable and consistent voltage levels. This feature is particularly useful in applications such as battery-operated devices, where a stable power supply is essential. Other options provided in the question refer to properties of alternating current or the requirements for transmission, which do not apply to direct current.