Mon Prof Augmenté
A Circuit That Lights a Bulb
Electricity can only flow when it has a complete path to travel all the way around. This loop of parts makes that path, so the bulb lights up.
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Age 9: open this week
Browse Age 9
In the picture
- The battery, which pushes the electricity out and around the loop.
- The red wire, the path the electricity travels along.
- The bulb, which glows when electricity passes through its thin filament.
- The switch, with its lever pressed down so the loop is joined.
Examples
- A torch lights up when you slide its switch, joining the battery to the tiny bulb inside.
- A doorbell rings only while your finger holds the button down and closes the circuit.
Key takeaways
- Electricity flows only in a complete loop, from one end of the battery back to the other.
- A switch works by joining that loop or breaking it.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
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