Which phrase best describes a closed circuit?

• A. A circuit with no complete path.
• B. A circuit with a break.
• C. A circuit where current can flow.
• D. A circuit without a source.

Answer: (C)

A closed circuit provides a complete, unbroken path for electrical current. When the loop is complete and there’s a source of voltage, electrons can flow from the source through the wires and the device, then back to the source, powering the load. That flow of charge is what we call current. If any part of the path is missing or broken, the loop isn’t closed, so current cannot flow and the device won’t operate. Even a loop with no energy source won’t sustain current because there’s no driving force. Therefore, the best description is a circuit where current can flow.