pdf, 101.5 KB
pdf, 101.5 KB
pptx, 197.61 KB
pptx, 197.61 KB
docx, 13.42 KB
docx, 13.42 KB

AQA A-level Physics Option C lesson on engine efficiency, heat pumps and refrigerators. 17 editable slides, 29-mark worksheet and mark scheme.
What’s in the PowerPoint
• An engine power starter, with answers in the speaker notes
• Input power and the three efficiencies
• The second law, with an energy flow diagram
• Real and maximum theoretical efficiency
• Combined heat and power
• Refrigerators and heat pumps, and the coefficient of performance
• Worked examples on efficiency and a heat pump
• A common mistakes slide
• Six check questions with answers, and an exit ticket
• Teacher notes in the speaker notes throughout
What’s in the worksheet (29 marks)
• Recall of the efficiency equations and the second law
• Thermal, mechanical and overall efficiency
• Second law, refrigerator and heat pump calculations
• Explaining CHP and why real engines fall short
• A full mark scheme with mark points, on separate pages
Good for
First teaching, revision, homework, cover lessons or independent study. Both files are fully editable in PowerPoint and Word.

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