Put an object in the gap, close the switch and see if the bulb lights. Find out which things let electricity pass.
Words to know
Circuit
A closed path that electricity flows around.
Conductor
A material that lets electricity pass, like metals.
Insulator
A material that does not let electricity pass, like plastic or wood.
Switch
A device that opens or closes a circuit.
Quick check
Answer 3 questions to check what you learned.
Try at home
Look around your home for switches and plugs. Which parts are metal and which are plastic? The plastic covers keep you safe because plastic is an insulator. Never touch the inside of a socket.