Attached is a complete lesson on Energy dissipation for KS3 Energy Transfers topic. It covers energy dissipation, energy transfers and efficiency calculations. For high ability students you could get them to have a go at creating Sankey diagrams on wasted and useful energy.
I have created a step by step narrative on Efficiency calculations that can be used as an activity with the students. You may find that the high ability students do not need this extra support.
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£5.00