Household electrical circuit – fuse, switch, socket and overload

Design & TechnologyElectrical Engineering & SafetyAges 13–14

A diagram of a 220 V household circuit: supply → protective device (fuse or circuit breaker) → parallel branches of switch–lamp pairs and a socket. Students click switches to turn lamps on, plug a device into the socket, and watch the total power and current I = P/U; when the current exceeds the rated value, the fuse heats up and blows (or the breaker trips) and the whole circuit loses power. Replace the fuse or reset the breaker to continue.