What is the basic concept of electrical current?

• A. Power source
• B. Complete circuit
• C. Anode
• D. Cathode

Answer: (A)

Electrical current is the flow of electric charges through a conductor, and what drives that flow is a potential difference provided by a power source such as a battery or generator. The power source supplies the energy that pushes charges around the loop, creating current. Without this energy source, there would be little or no sustained movement of charges, even if a path exists.

A complete circuit is important because it provides the closed path for charges to return, but it’s the source of the pushing force that actually causes the current to flow. The terms anode and cathode refer to specific electrode roles in particular devices and don’t define the basic idea of current itself. So the power source best captures the fundamental driver of electrical current.