An electrical relay is a type of remote-control switch able to handle high-current accessories. Marlan Davis explains a 12-volt relay and how it works.

This low current relay circuit is designed to be used in battery operated electronic devices. Its operating current is in micro amperes (µA). This is done by using a bistable relay and adding some ...

In essence a relay is an electro-magnetic switch which uses a small current – the “control current” – to close a circuit in which a much bigger current can then flow. At the heart of a ...