Which term describes a constant electric current that flows in one direction?

The term that describes a constant electric current flowing in one direction is direct current (DC). DC is characterized by the steady and unidirectional flow of electric charge, which means that the electric charge moves uniformly in a single direction over time. This is commonly used in various applications, such as in batteries, where the flow of current can be easily traced from the positive terminal to the negative terminal, providing a stable and reliable source of electricity.

In contrast, alternating current (AC) continuously changes direction and varies in magnitude, which is not the case with DC. Voltage is a measure of the electric potential difference between two points and does not refer to the direction of current flow. Electromagnetic current is not a standard term used in electrical terminology and does not specify a current type or behavior. Thus, direct current is the correct term for a constant electric current flowing in one direction.