This exam focus covers Exam Focus: Efficiency within Efficiency for GCSE Physics. Revise Efficiency in Energy for GCSE Physics with 19 exam-style questions and 4 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 11 of 13 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 11 of 13
Practice
19 questions
Recall
4 flashcards
🎯 Exam Focus: Efficiency
How this topic appears in exams:
- Calculation (2-3 marks): Calculate efficiency as a decimal or percentage from given input/output values
- Rearranging (2 marks): Find useful output or total input given the efficiency and one energy value
- Sankey diagram (3-4 marks): Draw or complete a Sankey diagram with correct proportional arrow widths
- Interpretation (2 marks): Read an efficiency value from a Sankey diagram and identify which device is more efficient
- Explain energy dissipation (3 marks): Describe how energy is wasted and why it cannot be easily recovered