New
New
Year 6

# Investigating voltage: do and review

I can investigate and explain how voltage affects the brightness of a bulb in a circuit.

New
New
Year 6

# Investigating voltage: do and review

I can investigate and explain how voltage affects the brightness of a bulb in a circuit.

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## Lesson details

### 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.

### Common misconception

The voltage of a cell is proportional to the size of the cell. Voltage is a tangible substance rather than a measure of electrical “push”.

Teaching slides and CfUs will clarify that voltage is a measure of the size of the push provided by a cell or other source of electricity and that cell size is not proportional to voltage.

### 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.

Remind pupils to make sure they do not introduce extra variables in their measurements of light. They need to keep the sensor the same distance from the light each time.
Teacher tip

### Equipment

Equipment to investigate the effect of voltage on the brightness of bulbs: bulbs, wires, cells, light sensor and data logger or app on mobile phone or tablet to measure light.

### Content guidance

• Equipment requiring safe usage.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
What does the V on a cell or battery stand for?
value
vents
Q2.
Which of the following statements is correct?
Correct answer: Voltage is the measure of electrical push and volts are the units used.
Volts is the measure of electrical push and voltage is the units used.
Q3.
What effect would removing cells from a circuit have on the voltage of the circuit?
It would go up.
It would stay the same.
Correct answer: It would go down.
Q4.
Which of the following statements is correct?
Larger cells have a higher voltage.
Smaller cells have a higher voltage.
Correct answer: The voltage cannot be predicted from the size of the cell.
Q5.
What is the voltage of the cell shown? You do not need to include the unit in your answer.
Correct Answer: 3 , 3 V, 3V , three
Q6.
Cells with a higher voltage provide a __________ electrical push to a circuit.
slower
faster
weaker

## Exit quiz

### 6 Questions

Q1.
Changing the voltage of cells and batteries can affect the of a bulb in a circuit.
Q2.
Which of the following methods can be used to measure the brightness of a bulb?
Correct answer: using a light sensor and a data logger
using a light saber
Q3.
Which of the following is the unit used for measuring the brightness of a light?
lox
lax
lex
lix
Q4.
If a lower voltage is used in a circuit containing a bulb, the bulb would be ...
more colourful.
brighter.
Q5.
Which of the following causes a bulb to 'blow' or burn out?
Correct answer: the voltage being too high
the voltage being too low
there being too many switches
there being too many wires
Q6.
Which of the following describes sharing results by saying them out loud?
a graph
a written description