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

• A. It creates a permanent connection to complete a path or modify logic.
• B. It increases series impedance
• C. It provides a shield for noise
• D. It reduces potential differences by filtering

Answer: (A)

A bridging wire is used to create a direct, permanent electrical connection between two points so a circuit path is completed or a specific logic state is forced. In a control circuit, this means wiring a jumper to tie points together so current can flow along a chosen path, effectively setting a fixed condition or bypassing a portion of the circuit as needed. This is how you configure default states or ensure a path remains closed regardless of other components in the line.

It isn’t about increasing impedance, shielding against noise, or filtering to reduce potential differences. Those functions relate to limiting or protecting signals, whereas a bridging wire’s purpose is to establish a solid connection that completes the circuit or enforces a particular logic outcome.