system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do touch lamps work? Recently went home for the holiday and my nephew had one. One of those touch anywhere and it turns on lamp? How does that happen?
gpt
Touch lamps will send a very low current through the metal parts of the lamp. Your skin can hold an electrical charge. We say that it has capacitance. The circuitry in the lamp can detect the change in capacitance when you touch the lamp. It interprets this change in capacitance as an instruction to turn on.

You'll notice that it doesn't work if you touched the lamp with a piece of dry cloth but probably would with a wet one.