Light-up paper circuit card
You'll need: copper foil tape, a 5mm LED, a CR2032 coin battery, cardstock, clear tape
- Draw two lines on the card that almost meet — one for + and one for –.
- Lay copper tape along each line, leaving a small gap.
- Spread the LED legs and tape the longer leg to the + line and the shorter leg to the – line.
- Fold a corner over the coin battery so pressing it closes the circuit and the LED lights.
Talk about it: What happens if you flip the battery over? Why?










