Which component physically moves to operate a mechanically operated device?

Which component physically moves to operate a mechanically operated device?

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

Answer: (B)

When a device is driven by electrical input, the part that actually translates that energy into motion is the plunger. Energizing the coil creates a magnetic field that pulls the plunger inward, producing the linear movement needed to actuate the mechanism. The coil itself stays in place; its role is to generate the magnetic field. The contacts are what get opened or closed as a result of the plunger’s movement, not the moving element itself. In this setup, the plunger is the component that physically moves to operate the device.

When a device is driven by electrical input, the part that actually translates that energy into motion is the plunger. Energizing the coil creates a magnetic field that pulls the plunger inward, producing the linear movement needed to actuate the mechanism. The coil itself stays in place; its role is to generate the magnetic field. The contacts are what get opened or closed as a result of the plunger’s movement, not the moving element itself. In this setup, the plunger is the component that physically moves to operate the device.