A relay is an electrically operated switch. It has a set of input terminals for one or more control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple …

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Sep 11, 2024 · A Relay is a simple electromechanical switch. While we use normal switches to close or open a circuit manually, a Relay is also a switch that connects or disconnects two circuits.

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Dec 20, 2025 · relay, in electricity, electromagnetic device for remote or automatic control of current in one (relay) circuit, using the variation in current in another (energizing) circuit. For example, in a …

Nov 24, 2025 · A relay is an electrical relay device, equivalent to a switch controlled by electrical signals. Relays can control high-power load circuits through low-power control circuits and are key …

Mar 8, 2024 · Learn how a relay works and how you can use it to turn on/off high-power devices with tiny signals. Includes practical circuit examples.

Mar 11, 2021 · In simple terms, a relay is a switch that can be turned on or off by using a low voltage and can also be used to control multiple circuits with just one switch. Relays allow complete electrical …

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A relay is an electromagnetic switch that opens and closes circuits electromechanically or electronically. A relatively small electric current that can turn on or off a much larger electric current operates a relay.