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The purpose of a relay is to allow a low power circuit to engage a high power circuit. A great example is the starter relay which connects the battery to the starter motor. The starter can draw as much as 200 + amps of power, which would melt your ignition switch if that much power went through the normal ignition swtich. Basically the coil creates a magnetic field wich draws the points together to create the higher power circuit.
regards
Mech
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