things you will need
- Play dough (shop bought or make your own)
- 1 x LED
- 1 x 4 AA battery pack (plus batteries)
- Items to test
- Always ask a grown-up for help with batteries.
- Always make sure battery packs are in the OFF position when not in use. Batteries and circuits can get hot and cause fires.
- Never connect a LED directly to the battery. The voltage will be too much for the little LED and it will pop.
- LEDs have pointy legs and can be sharp.
Prepare the dough
Roll out the dough into two pieces roughly the same size.
Connect to the battery pack
- Place the red wire from the battery pack into one dough roll.
- Place the black wire into the remaining dough roll.
Test the circuit
- Take one LED and separate the legs.
- Place the longer leg of the LED into the dough roll connected to red wire.
- Place the shorter leg of the LED into the dough roll connected to the black wire.
- Turn ON the battery pack and watch your LED light up.
Break the circuit
- Divide the dough roll connected to the black wire into two equal sections.
- Create a small gap between the two sections.
Test for conductivity
- Your conductor tester is now ready to go.
- Place your first item between the two dough sections connected to the black wire.
- Press the item into both dough sections to ensure you make a complete circuit.
- If the LED lights up, the object is a conductor.
- If the LED does not light up, the object is an insulator.
Try the test on other objects (with permission from grown-ups) around the house.
Do any surprise you?