Three-Way Switches

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Three-way switches allow a light to be turned on or off independently at two different locations—for example, at the top and bottom of a staircase. Each switch has three terminals. The circuit is arranged so that the light is on when both switches are in identical configurations and off when they are in opposite configurations.

Contributed by: S. M. Blinder (March 2011)
Open content licensed under CC BY-NC-SA



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