How does an electronic relay work?
Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, 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.
How do you make a relay switch?
Construct the first circuit as follows:
- Take one iron C-core.
- Wind twenty turns of PVC-covered copper wire round one arm.
- Connect one end to one terminal of the 1.5 V cell.
- Connect the other end to the switch.
- Complete the circuit by connecting the other end of the switch to the free terminal of the cell.
How do you connect a relay to a battery?
Attach one spade connector to relay terminal 86 (coil +). Attach the other to relay terminal 85 (coil ground). Touch the 86 wire to the battery’s positive post, and the 85 wire to the battery’s negative post. Actually, unless the relay has a diode in it, it won’t matter if the polarity is switched; the electromagnet will be energized regardless.
How are relays used to override other relays?
All three relays must be activated for the light to turn on. This sample demonstrates how relays can override relays. In this sample, the left two relays must be activated to turn on the light. Optionally, the third relay can be used to override the first two relays and activate the light.
How are two relays used to activate a light bulb?
It is possible to use Two relays to create a Normally Closed condition. This sample demonstrates how a relay can be used to activate a light bulb. When the relay turns on, the light comes on. Only one power wire is switched with this sample using the COM (common) and NO (normally open) connections of a relay.
How to connect relays for logical switching applications?
Relay Logic is all about wiring up Relays for Logical Switching applications. This page demonstrates several simple ways to wire a relay for various applications. Relay Logic provides you with a guide for using NCD relay controllers, and how they can be wired for many types of applications.