What is a relay?

A relay is defined as an electromagnetic remote control switch. It operates by using an electromagnetic coil to open or close one or more sets of contacts, and it is utilized to control a circuit with a low-power signal. When an electric current flows through the coil, it creates a magnetic field that moves an armature, changing the state of the contacts. This allows a relay to control larger electrical loads without requiring direct wiring to high-voltage components, making it a crucial component in many electronic systems. The versatility of relays in remote operation and automation applications underscores their importance in electrical engineering and automation technology.