Relay switch explained here, Relay are switched but use an electromagnet to mechanically operate a circuit
Relay can use every low power signal to operate a high power circuit
Relays control one electrical circuit by opening and closing contacts in another circuit. when a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized.
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