Which type of current flows continuously in one direction?

Direct current (DC) is characterized by the flow of electric charge in a constant direction. This means that the voltage in a DC circuit remains steady over time, allowing the current to flow uninterrupted. Common sources of DC include batteries and solar panels, which provide a stable and reliable power source for various applications.

In contrast, alternating current (AC) periodically changes its direction and magnitude, making it suitable for transmitting electricity over long distances but unsuitable for applications requiring a constant voltage. The other terms mentioned, "transitional current" and "reversed current," are not standard terminology used to describe types of current flow in electrical engineering, thus reinforcing that DC is the key concept when discussing continuous flow in one direction.