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Topic 3: Conservation of energy
Quick questions on Efficiency - Edexcel GCSE Physics
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is q1?Show answer
A device transfers usefully from a total input of . Calculate the efficiency as a percentage. [2 marks]
What is q2?Show answer
State why a real device can never be efficient. [1 mark]
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