In a control circuit, what is the purpose of a jumper or bridging wire?

• A. It creates a permanent or temporary connection to complete a path or modify logic.
• B. It grounds the circuit to prevent floating nodes.
• C. It replaces a failed relay coil automatically.
• D. It increases the power rating of the circuit.

Answer: (A)

A jumper or bridging wire is used to connect two points so the current can flow along a chosen path, effectively completing a circuit or setting a specific logic condition. In control circuits, you’ll see them used to configure operating modes, bypass a section for testing, or route signals by linking terminals that wouldn’t be connected otherwise. The key idea is that the jumper creates a direct link to make the desired path work, and it can be installed temporarily for testing or permanently for a fixed configuration. It isn’t meant to ground a circuit or serve as a safety reference, and it doesn’t replace a failed relay or change the circuit’s power rating—those outcomes come from other components and design choices. Ensure any jumper is rated for the current it may carry and placed correctly to avoid unintended paths or shorts.