Science at key stage 3 (Year 9)
Unit 9I: Energy and electricity
Section 7: e. How does electricity transfer energy?
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Objectives |
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- to apply scientific knowledge to explain the use and occurrence of high voltages
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Activities |
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Outcomes |
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Children: |
- Use the Electricity Council video
Electric graffiti, or other secondary sources, to identify the hazards of high voltages and associate these with the transfer of large amounts of energy,
eg lightning, overhead and power lines on railway tracks.
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- give a reasoned report associating the use/hazard of high voltage with energy transfer
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Points to note |
- Reactivity of metals is covered in unit 9F 'Patterns of reactivity'.
Safety
- a dry cell contains hazardous chemicals. The use of solutions such as vinegar or lemon juice provides a cheaper alternative to a range of fruits. The size of the voltage depends mainly on the difference in reactivity of the metals used as electrodes,
eg the best will probably be copper and magnesium, giving about 1.5V
- pupils' plans should be checked for health and safety before practical work begins
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This unit is divided into sections. Each section contains a sequence of
activities with related objectives and outcomes. You can view this unit by
moving through the sections or print/download the whole unit.
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