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The relay is used to "interlock" a circuit. It consists of a coil and a number of auxiliary "normally open" or "normally closed" contacts. A limiting condition is wired through the coil contacts and resulting conditions are wired through the auxiliary contacts. When the limiting condition is met, the coil will pull in and change the state of the auxiliary contacts. For example, if you want a lamp (lamp 1) to turn off when a second lamp (lamp 2) is turned on, lamp 1 would be wired through a "normally closed" set of contacts and lamp 2 would be wired through the coil contacts. When lamp 2 is turned on, the coil will pull in and open the "normally closed" contact for lamp 1, turning it off.
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What effect of an electric current does a relay and transformer use?
I'm just here cause I'm doing work and no answer was here and I
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