How do electrical relays work?
An electrical relay is a switch that typically uses an electromagnet to control the flow of current in a circuit. Electromagnets generate magnetic fields, and are usually formed from current-carrying wires that may or may not be wrapped around iron.FeaturesThere are many types of relays, and many are built using one or more switches placed near an electromagnet. Some of them do not use levers, but use electrical signals to turn components on and off.ElectromechanicalWhen a threshold voltage is reached, the electromagnet turns on, and uses a spring to move a lever to make a switch open or close. When there is no current, the electromagnet turns off, and the switch does the reverse action by either closing or opening.Solid-StatePure solid-state relays do not have any moving parts. They use the output of semiconductors such as transistors and SCRs to control current to loads such as circuits. SCRs, or silicon-controlled rectifiers, are like transistors except that they are optimized for s
