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RELAY
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What is a Relay?

A relay is a switch that activates a current that turns on a separate circuit. A relay is utilized when a separate circuit is needed or if multiple circuits need to be controlled by an individual signal.  An example of a relay in action is starting a car. A car key doesn’t power a car battery directly, but instead, the ignition signals the relay, which then transfers the signal for the car to start.

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