AQA spec link: Aiming for Grade 4 LOs: Lesson Overview Resources 1.2.2 The energy efficiency for any energy Describe an efficient transfer as one that Starters Practical: transfer can be calculated using the equation: transfers more energy by a useful process. Investigating Staying on (5 min) Ask students to explain why some State that the efficiency of an energy transfer is efficiency. efficiency = useful output energy transfer electrical devices of the same type (e.g., two different models always less than 100%. total input energy transfer of last longer than others even though they use the Interactive: Car Calculate the efficiency of a simple energy same batteries. efficiency. transfer. Students should be able to describe ways to Efficiency (10 min) Ask students what is efficiency and why increase the efficiency of an intended energy is it wanted? What are the advantages of an efficient device? Aiming for Grade 6 LOs: transfer. Form students into groups and ask them to agree on a Calculate the efficiency of a of energy simple description of what efficiency is and why it is transfers. important. Use the law of conservation of energy to explain why efficiency can never be greater than 100%. Main Investigate the efficiency of a Investigating efficiency (40 min) Recap the systems used for measuring quantities, particularly the joule and newton as these are required later.Discuss input and output energy in Aiming for Grade 8 LOs: terms of how much energy is transferred from the starting Describe design features that can be used to stores into the stores we want it to be. This leads to improve the efficiency of an energy transfer. calculations of efficiency based on these values. Students Rearrange the efficiency equation to find input should try a few of the calculations to ensure that they can do or total output energy. them. Explain the limits to efficiency, linking this to the law of Evaluate in detail an efficiency investigation to conservation of energy. Students try an efficiency justify conclusions. measurement using the practical. Ensure that they are calculating work done correctly and finding the energy supplied to
AQA spec link: 1.2.2 The energy efficiency for any energy transfer can be calculated using the equation: efficiency = useful output energy transfer total input energy transfer Students should be able to describe ways to increase the efficiency of an intended energy transfer. Aiming for Grade 4 LOs: Describe an efficient transfer as one that transfers more energy by a useful process. State that the efficiency of an energy transfer is always less than 100%. Calculate the efficiency of a simple energy transfer. Lesson Overview Starters Staying on (5 min) Ask students to explain why some electrical devices of the same type (e.g., two different models of last longer than others even though they use the same batteries. Efficiency (10 min) Ask students what is efficiency and why is it wanted? What are the advantages of an efficient device? Form students into groups and ask them to agree on a simple description of what efficiency is and why it is important. Main Investigating efficiency (40 min) Recap the systems used for measuring quantities, particularly the joule and newton as these are required later.Discuss input and output energy in terms of how much energy is transferred from the starting stores into the stores we want it to be. This leads to calculations of efficiency based on these values. Students should try a few of the calculations to ensure that they can do them. Explain the limits to efficiency, linking this to the law of conservation of energy. Students try an efficiency measurement using the practical. Ensure that they are calculating work done correctly and finding the energy supplied to Resources Practical: Investigating efficiency. Interactive: Car efficiency. Aiming for Grade 6 LOs: Calculate the efficiency of a of energy transfers. Use the law of conservation of energy to explain why efficiency can never be greater than 100%. Investigate the efficiency of a Aiming for Grade 8 LOs: Describe design features that can be used to improve the efficiency of an energy transfer. Rearrange the efficiency equation to find input or total output energy. Evaluate in detail an efficiency investigation to justify conclusions.
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