How do Christmas lights work? How are they wired so that if one light goes out they all go out? And how does using one of those light guns fix all of them?
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Note: This is not an issue for most modern lights and this applies mostly to older versions.
The lights you are talking about have this issue because they run the circuit directly through each of the bulbs. So when one bulb’s filament burns out, it breaks the entire circuit and cuts the flow of electricity to all of the bulbs.
Most modern versions have an alternate flow channel in them, so if a bulb breaks and cannot complete the circuit, the circuit still has an alternate way to keep flowing.
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