Appliance science
Appliance science
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Resource from the ENGAGE project, which won 'best open educational resource (2017)'
The EU has imposed limits on the power ratings of vacuum cleaners, and further limits on other appliances could soon be in place. In this activity students consider a further (fictional) future restriction, on home electricity use. Students calculate the energy transferred daily by the appliances they use. They are then set the challenge of deciding how to cut their personal electricity consumption - do they go for a shorter shower or banish blow-dries?
Learning objective
- Solve a problem using scientific knowledge of the power ratings of electrical appliances and the energy they transfer.
Blueprint curriculum link
- Unit: Home electricity
- Concept: Power: Power is a quantity that measures how quickly energy is transferred. The power of an electrical device depends on the potential difference across it and the current through it.
- Skills: Algebra: Substitute numerical values into algebraic equations using appropriate units for physical quantities
- Learning stage: Analyse
Activity contents
- Teachers guide
- PowerPoint file
The activity is delivered as a zip file. After you checkout, you will be sent an email with the link to download it.
Weblinks
The news story that the activity was based on.
Draft proposal which outlines possibilities for future restrictions on electrical appliances.
Q&A
For the Year 7 Mastery Practice book:
For the Y9/GCSE Mastery Practice Book:
It was written to help year 7 students learn to transfer the scientific knowledge to unfamiliar situation. It can also be used by students in other years to improve their understanding of the fundamental concepts. Learning to apply is what will give students access to the 60% of marks at GCSE that demand more than recalling content. The book uses a research-based approach to teach students how to solve different types of problems.
The Practice Book has a chapter on each unit in the year 7 curriculum, based on a 5-year curriculum and AQA's KS3 Science Syllabus. Download the sample material to see exactly what concepts and types of problems are included.
The first strategy studente need to learn is to evaluate the problem and what knowledge is needed to solve it. 'Detect' simulates how an expert looks at a question. They make sense of the situation, look beyond the superficial details to find the deep structure This allows them to recognise this as an example of a problem type they have seen before, and recall the organised information they need to solve - key concepts. It ensures that students avoid their inclination to just look at the keywords, and dive in risking misunderstanding the situation. Detect is broken down into smaller steps, usually: draw a diagram, show values, identify unknown, decide the concept
This encourages students to bring into their working memory all their existing knowledge, externalise it on paper (to reduce working memory demands), and then home in on what's relevant to solving the problem.
The third stage of the problem solving strategy is the actual solution process using the knowledge from Recall.The Solve starts by showing how to use the knowledge from Recall and models a step by step process of moving towards a solution for the problem.We teach students how to write answers scientifically, using a variety of structures like claim-evidence-reasoning, and problem-solution, and cause-effect.
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