Key learning points

1. Equipment such as a light sensor and data logger can be used to measure and record bulb brightness in lux.
2. Changing the voltage of batteries can affect the brightness of a bulb in a simple circuit.
3. A lower voltage leads to a dimmer bulb and a higher voltage leads to a brighter bulb.
4. A higher voltage can cause the bulb to burn out or blow due to excess heat generated.
5. The results of an investigation can be recorded in a table and presented using verbal and written forms.

Keywords

• Voltage - Voltage is a measure of the size of the push provided by a cell or other source of electricity.

• Brightness - The brightness of a bulb is the amount of light it gives out.

• Affect - To affect something or someone is to change it or how it behaves.

• Cell - A cell is a single unit that is needed for electricity to flow around a circuit.

• Lux - Lux is the unit used to measure the brightness of a bulb or light.

Common misconception