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http://www.electronics-tutorials.ws/io/io23.gif

This image is a awesome example of a modern relay that's inside one of those box's. See the magnet causes the metal to move by pulling it to the...

A Mechanical Relay is sort of 2 Poles with a metal sheet between them.One pole is a coiled magnet and when its charged by 1 type of current it causes the two other elements to come in contact...