circuit

Safety Check Do not play with electricity. Do not place objects on top of electrical cords or wires becasue the wires may become damaged. When using electrical devices, follow all instructions. When you remove a plug from a wall outlet, use the plug; do not pull on the cord.

When you flip a light switch on and off, you are closing and opening a circuit. A circuit is the path that electricity follows. For electrons to travel (creating an electric current), the circuit must be closed. When you flip the light switch off, you are opening the circuit and the lights turn off. When you flip the switch on, the circuit it closed and the lights come on.
Let's take a closer look at circuits . . .
Here are common circuit parts along with how the part is drawn in a circuit diagram:
 Voltage source
 Conductor
 Load
 Switch