Which of the following represents a charge that flows in one direction?

• A. Alternating current
• B. Direct current
• C. Reactive current
• D. Voltage

Answer: (B)

The concept of electric current is vital in understanding how electricity flows. Direct current (DC) is characterized by the flow of electric charge in a single direction, typically from the negative terminal to the positive terminal of a voltage source. This unidirectional flow is what distinguishes DC from alternating current (AC), where the direction of current flow reverses periodically.

In practical terms, DC is commonly used in battery-powered devices, where a consistent voltage is needed to operate electronic components without any fluctuation in direction. Such stable delivery of current is vital for devices that require a constant power source to function effectively.

By contrast, alternating current involves a bidirectional flow of electricity, while reactive current refers to the current that oscillates in phase with voltage but does not result in net energy transfer. Voltage is a measure of electric potential and does not represent a flow of charge itself. Understanding these differences underscores why the representation of a charge flowing in one direction is specifically associated with direct current.