What type of electrical current only flows in one direction?

Direct current, or DC, is characterized by the flow of electric charge in a single direction. This type of current is commonly produced by batteries, where the voltage remains constant over time, leading to a steady flow of electrons.

In various applications, such as electronic devices and circuits, direct current is crucial because it ensures a stable voltage, allowing for consistent operation. Unlike alternating current, which periodically reverses direction, direct current maintains a fixed polarity, enabling it to supply power efficiently for numerous devices.

While other types of current may exhibit changing qualities or functions, direct current's unidirectional flow is a distinguishing feature that underlines its importance in both practical and theoretical contexts in physics.