When a switch is open (off), there is a gap in the circuit. Electricity cannot travel around it and a components in the circuit will turn off. When a switch is closed (on), the circuit is complete.

Learn about the roles of each component in an electrical circuit with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize.

If you want to easily control the power in a circuit, you’ll probably reach for the classic toggle switch. While there’s certainly nothing wrong with that, physical toggles are a bit da… ...