When you put the symbols together, you make a map of the circuit. This is what it looks like. The circuit is like a message in code. You read the code by following the path of electrons through the circuit map. See if you can explain it to a friend.
Lamps light up.
Toasters heat up. Vacuum cleaners vacuum. Radios turn on. Things that bring light, heat, movement and sound all need the same thing-electrons. Every time you turn on a lamp, you complete a circuit and electrons can flow.