The word circuit comes from the word "circle". A circuit is a pathway along which electricity can flow. If the path has a break in it (the switch is open), then the electrons are stopped from flowing around the pathway. This is called an open circuit. When the switch is closed (a closed circuit), the pathway is completed and the electrons can continue flowing around the pathway. Instead of saying a switch is on or off, electrical professionals say a switch is open or closed.
- Wrap the stripped end of one wire around one of the brass paper fasteners.
- Place the brass paper fastener with the wire attached through the paper clip.
- Wrap the second wire around the second paper fastener (just like step 1).
- Make a hole in the piece of cardboard with a pencil and stick the first fastener with the paper clip though the hole.
- Mark the place where the end of the paper clip falls on the cardboard.
- Make another hole with your pencil at the mark on the cardboard and push the second paper fastener through it.
- Turn the carboard over and open up the fasteners. You can put tape over the open fasteners to hold them securely.
