In a relay, which component physically moves to operate a mechanically operated device?

In a relay, which component physically moves to operate a mechanically operated device?

• A. Armature
• B. Contacts
• C. Coil
• D. Plunger

Answer: (D)

When a relay operates, it converts electrical energy into mechanical motion. Energizing the coil creates a magnetic field that pulls the movable core—the plunger—into the magnetic gap. That linear movement of the plunger actuates the switch mechanism, moving the contacts (or the part connected to them) to open or close the external circuit. The coil and housing stay stationary; it’s the plunger’s motion that directly drives the mechanical operation.

When a relay operates, it converts electrical energy into mechanical motion. Energizing the coil creates a magnetic field that pulls the movable core—the plunger—into the magnetic gap. That linear movement of the plunger actuates the switch mechanism, moving the contacts (or the part connected to them) to open or close the external circuit. The coil and housing stay stationary; it’s the plunger’s motion that directly drives the mechanical operation.