![How Christmas Lights work (why when one bulb burns out they all go out, and about new lights) - YouTube How Christmas Lights work (why when one bulb burns out they all go out, and about new lights) - YouTube](https://i.ytimg.com/vi/0MOpfT0f7bQ/maxresdefault.jpg)
How Christmas Lights work (why when one bulb burns out they all go out, and about new lights) - YouTube
If electricity always chooses the path of least resistance, then how do Christmas tree lights work if there is a parallel wire next to the bulbs? - Quora
![led - How to find a faulty bulb in a Christmas lights string - Electrical Engineering Stack Exchange led - How to find a faulty bulb in a Christmas lights string - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/R7qjn.jpg)