I posted this link a couple years ago, but just in case you need to draw a Christmas Tree:
There are a lot of interesting variations posted, maybe PF could have our own contest!
I helped my neighbour putting up (quite old, no LEDs) strings of Christmas lights and noted that some of them (different brands) are connected in parallel, others in series.
Inevitably, we found several of the serial strings not working due to defective bulbs. We replaced the visibly...