If you have a set of christmas lights that is on a series circuit, predict what would happen if the series circuit were cut off in the middle. how would this differ from what would happen with a parallel circuit?

When all the lights are in series, and any one of them burns out

or is pulled out, or the wire between the lights is cut anywhere,

ALL the lights go out.

If all the lights were in parallel, then they're totally unaware of each

other, and the loss of any single light has no effect on the others.