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On the outside of the relay switch box there are four connections that are usually numbered on the bottom of the relay box, two of them resemble a negative and a positive connection (usually 12 to 24 volts) that when activated via a push button or a key switch like a car has, it then causes the electric magnet to push or pull an isolated metal lever that closes a gap between the other two connection legs so an isolated positive charge can flow through. The reason that relays are used in conjunction with a key or push button switch is because they are cheaper and easier to replace than a key or push button switch, and if there were no relays involved at all then a key or push button switch would overheat and burn up from carrying to much current. Multiple relays don't require much current to be activated and can individually carry larger amounts of current to the various components in a car or a home stereo and other types of electronics, that is why you hear a click sound when you turn on a monitor or stereo, it is the electric magnet closing the gap!

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Q: How do relay switches use electromagnets?
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