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a light bulb as the ones used in lamps. lights by fine filament inside the sealed vacuum bulb. one side of the filament connects to the bottom raised portion. the other end of filament connects to the silver screw in part. when the light bulb is screwed all the way down, the bottom of the bulb hits the slightly raised flap at the bottom of the socket. pos.+. and the side of socket is in contact with the side of bulb. Neg.-.put on switch and and electricity flows through the filament, you have light.

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