In relay logic, what component closes or opens paths to energize a load when the coil is energized?

• A. relay contacts
• B. diodes
• C. fuses
• D. transistors

Answer: (A)

Relay logic relies on a coil to create a magnetic field that moves switching contacts. Those contacts are the parts that actually close or open the path to the load when the coil is energized. If the contact is normally open, energizing the coil brings the contacts together to complete the circuit and power the load; if a contact is normally closed, energizing the coil opens that path to stop energizing the load. This mechanical switching is what translates the control signal into power delivery.

Other components have different roles. Diodes steer or protect current but don’t mechanically switch the load path in response to the coil. Fuses protect against overcurrent, not control when a load gets powered. Transistors can act as switches in solid-state circuits, but they don’t provide the physical contact closure that a relay uses to energize a load.