Which statement best distinguishes a circuit from a branch circuit?

• A. A circuit is any path for electrical flow; a branch circuit is a portion of a circuit that feeds a load.
• B. A circuit is the same as a branch circuit.
• C. A circuit is only the wiring inside a panel; a branch circuit is external.
• D. A circuit is for lighting only; a branch circuit is for power.

Answer: (B)

The main idea is understanding how a circuit and a branch circuit relate in a wiring system. A circuit is the full path electricity takes from the source, through conductors and protection devices, to the loads and back. A branch circuit is the specific portion of that path that delivers power to a particular load or group of loads. In other words, the branch circuit branches off the overall circuit and runs from the overcurrent device in the panel to outlets, lights, or other devices it serves. This distinction matters for how protection and wiring are applied, since each branch circuit has its own protective device and is sized to a particular set of loads, while the full circuit encompasses the entire route from source to loads, including all branches. The other statements don’t fit because a circuit isn’t just the wiring inside a panel or limited to lighting versus power in general, and a branch circuit is not the same thing as the entire circuit.