Learning objective
Explain why no heat engine is perfectly efficient.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Thermodynamics and engines
Subtopic
Second Law and engines
Aqa A Level PhysicsEngineering physics
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Quick explanation
Explain why no heat engine is perfectly efficient
- This point belongs to Thermodynamics and engines, especially Second Law and engines.
- You need to be able to explain why no heat engine is perfectly efficient.
- The key ideas to know are efficient, heat, and perfectly.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
efficientheatperfectlyengine
Why it matters
This objective helps connect Second Law and engines to exam-style questions, flashcards, and revision notes for Thermodynamics and engines.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- State the first law of thermodynamics.
First law of thermodynamics
- Distinguish heat supplied, work done and internal energy change.
First law of thermodynamics
- Apply sign conventions consistently.
First law of thermodynamics
- Analyse energy transfers in thermodynamic processes.
First law of thermodynamics
- Describe common non-flow thermodynamic processes.
Non-flow processes