Learning objective
Express efficiency as a percentage.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Flashcards
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Questions
Topic
Conservation and dissipation of energy
Subtopic
Efficiency
Study support
Understand this objective
Quick explanation
Express efficiency as a percentage
- This point belongs to Conservation and dissipation of energy, especially Efficiency.
- You need to be able to express efficiency as a percentage.
- The key ideas to know are percentage and efficiency.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Efficiency to exam-style questions, flashcards, and revision notes for Conservation and dissipation of energy.
Quick student answer
What should you know about express efficiency as a percentage?
Direct answer
In Physics, this page helps you answer questions about express efficiency as a percentage within Conservation and dissipation of energy. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Efficiency and Useful energy.
Key terms
- Efficiency: The ratio of useful energy output to total energy input, expressed as a percentage.
- Useful energy: The portion of energy that performs a desired work or function in a system.
Common trap
Confusing Efficiency Representation: To express efficiency as a percentage, multiply the decimal value by 100.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- State that energy can be transferred usefully, stored or dissipated but cannot be created or destroyed.
Energy transfers in a system
- Describe examples of energy transfers in a closed system with no net change to total energy.
Energy transfers in a system
- Explain that energy is often dissipated into less useful stores during system changes.
Energy transfers in a system
- Use the term wasted energy to describe energy transferred in less useful ways.
Energy transfers in a system
- Explain how lubrication reduces unwanted energy transfers by reducing friction.
Energy transfers in a system