The relay's primary appeal is its ability to do a lesser-switch's bidding but it's capable of so much more. Relays can be wired together to create very useful, simple, and utterly reliable networks.

If you work on cars you’ve probably heard of relays; in fact, we often cover using relays in our tech articles. Following detailed instructions to wire one can work, but understanding what makes them ...

Generations of owners of German cars, struggling with maddeningly hard-to-diagnose electrical problems, would pull out these relays and test them in the (usually futile) hope that a simple $7.95 relay ...