What is a circuit?

What is a circuit?

• A. An open path that blocks current
• B. A device that stores energy
• C. A single wire with no load
• D. A closed loop that allows electricity to continually flow

Answer: (D)

A circuit is a closed loop that allows electricity to continually flow. For current to move, there must be a complete conducting path that starts at a power source, passes through any loads, and returns to the source. If the path is broken, current stops, so an open circuit can’t drive energy to a load. A device that stores energy isn’t by itself a circuit; it’s a component inside a circuit, but without a closed loop there’s no current. A single wire with no load also doesn’t form a complete loop, so no sustained current runs through it. In short, the essence of a circuit is a closed loop that provides a path for charges to circulate and deliver energy to whatever is connected along the way.

A circuit is a closed loop that allows electricity to continually flow. For current to move, there must be a complete conducting path that starts at a power source, passes through any loads, and returns to the source. If the path is broken, current stops, so an open circuit can’t drive energy to a load. A device that stores energy isn’t by itself a circuit; it’s a component inside a circuit, but without a closed loop there’s no current. A single wire with no load also doesn’t form a complete loop, so no sustained current runs through it. In short, the essence of a circuit is a closed loop that provides a path for charges to circulate and deliver energy to whatever is connected along the way.