4.1 Making a bulb brighter or dimmer

1. Electricity flows in a circuit.
2. We can use a bulb, a battery and a connecting wire to make a complete circuit.
3. We can add more batteries in a circuit to make the bulb brighter.
4. This is because more electricity flows in a circuit when more batteries are used.
5. If fewer batteries are used, less electricity flows in the circuit. This will make the bulb dimmer.
6. If more bulbs are used in a circuit, all the bulb will be dimmer.