Which term describes a circuit path that is broken and prevents current flow?

• A. Diode
• B. Battery
• C. An open circuit
• D. Cathode

Answer: (C)

An open circuit describes a circuit path that is broken, so current cannot flow. When a loop isn’t complete—such as a switch left open, a broken wire, or a blown fuse—the electrons have nowhere to go, and the current drops to zero, meaning the devices in the circuit don’t operate.

A diode is a component that allows current to flow in one direction when forward-biased, but it doesn’t by itself describe a broken path. A battery provides the energy to push current, yet again this doesn’t imply a break in the circuit. The cathode is a terminal on certain components, not the overall state of the circuit. So, the term that best fits a circuit path that’s broken and prevents current flow is open circuit.