Starter quiz
- What is the name for something that can be changed in an investigation?
- characteristic
- variable ✓
- changeable
- feature
-
- Which of these is not a component of an electrical circuit?
- motor
- engine ✓
- switch
- pulley ✓
-
What component is shown here?- 'buzzer' ✓
- In which of these circuits would the bulb produce light?
circuit 1
circuit 2 ✓
- Which of these cells would provide the smallest electrical push to a circuit?
cell 1 ✓
cell 2
- Why should you only change one variable in an investigation?
- It makes it easier to do the investigation.
- It allows you to work out what has caused an effect. ✓
- It allows you to complete the investigation quickly and efficiently.
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Exit quiz
- What do you call the equipment that detects the brightness of bulbs?
- light reader
- light bulb
- light sensor ✓
- light valuer
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- Which part of an investigation do scientists use to decide whether to support or reject a scientific theory?
- 'results' ✓
True or false? These results support the idea that adding bulbs reduces the brightness of a bulb.- True
- False ✓
If you have 8 volts push in a circuit and 4 bulbs, how many volts will each bulb receive?- 8
- 1
- 2 ✓
- 4
-
How can you make a bulb brighter in a circuit?- add more bulbs
- remove bulbs ✓
- remove cells
-
- What happens to the brightness of a bulb in a circuit if you position it closer to the cell?
- It gets brighter.
- It gets dimmer.
- It does not change. ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Equipment such as a light sensor and data logger can be used to measure bulb brightness in lux.
- Scientists use the results from investigations to support or reject scientific ideas and theories.
- Adding bulbs means that voltage is equally distributed among them all, so bulbs will be dimmer.
- A bulb will be the same brightness wherever you place it in a circuit.
Common misconception
Pupils may not understand how variables interact within a circuit and how changes in one variable can affect others.
Teaching slides will explain that variables are controlled in comparative and fair tests, and that the same can be done in circuits when adjusting variables like voltage to see how they affect things like brightness of bulbs.
Keywords
Circuit - An electrical circuit is a closed loop or path that electricity can flow through to make a component work.
Variable - A variable is something that can be changed, measured or kept the same in an investigation.
Brightness - The brightness of a bulb is the amount of light it produces.
Affect - To affect something or someone is to change it or how it behaves.
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