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eolas/zk/Relays.md
thomasabishop 9adcfd9ce9 Autosave: 2024-09-09 17:00:03
2024-09-09 17:00:03 +01:00

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Relays
electronics
Monday, September 09, 2024

Relays

A relay is an electrically operated switch.

It uses an electromagnet to mechancially operate a switch.

Core components

  • electromagnet
    • a coil of wire around an iron core
  • armature
    • a movable magnetic strip
  • contacts
    • electrical connections that can be open or closed
  • spring
    • returns the armature to its resting position when not energised

Operation

Operation of a relay

Current flows through the electromagnet which creates a magnetic field. This field attracts the armature which then moves to open or close the contacts. When the current stops, this returns the armature to its original position.