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An electrician has two two-way switches, a light bulb, and a power source. How should he connect the terminals so that either switch can be used to turn the light on or off?
Terminal D must connect to terminal I, and terminal E must connect to terminal J. D to J and E to I will also work. The light bulb and the power source must be connected in series, A to G, for example. Terminal F then connects to C and terminal B connects to H. F to H and B to C will also work. Either switch can then turn the bulb on or off.
