How Christmas Lights work (why when one bulb burns out they all go out, and about new lights)

How Christmas Lights work (why when one bulb burns out they all go out, and about new lights) from youtube by fnaguitarplayer9
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Video on how Christmas lights work and why when one bulb burns out they all go out, and about the new lights, that when they burn out, the rest of the strand still stays on.

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