GCSE Physics: Energy
Energy is the topic everything else in Physics connects to. Master the eight energy stores, the equations for kinetic, gravitational and elastic potential energy, and efficiency, and you have unlocked roughly a quarter of the paper.
Energy stores (kinetic, gravitational potential, elastic potential, chemical, thermal, magnetic, electrostatic, nuclear) and the four ways energy is transferred (mechanically, electrically, by heating, by radiation) are foundation knowledge that every other topic relies on. You should be able to describe the changes in energy stores for any process: a falling ball, a boiling kettle, a stretched spring.
The key equations are: kinetic energy = ½mv², gravitational potential = mgh (g = 9.8 N/kg on Earth), elastic potential = ½ke². You should be able to rearrange and substitute confidently. Many 4- and 5-mark questions combine two of these (e.g. a falling ball: GPE at top = KE at bottom).
Work done (W = Fd) and power (P = E/t = W/t) come up directly and as part of compound questions. Always check units: J for energy, W for power, m for distance, N for force.
Efficiency = useful output / total input, expressed as a decimal or percentage. Sankey diagrams (with arrow widths proportional to energy) appear as a structured question — you may need to label energies, calculate efficiency, or sketch the diagram from data.
Renewable and non-renewable energy resources, their advantages, disadvantages and the trends in their use round out the topic. Examiners ask you to evaluate a resource for a specific situation (a remote village, a city, a coastal town) using data — pure recall answers score poorly.
What you'll learn
- The full Energy sub-topic map and how it sits within GCSE Physics
- What examiners reward in Energy questions, command word by command word
- The most common Energy mistakes — and how to avoid them in your answers
- How to revise Energy with notes, flashcards, exam-style questions and the AI Study Coach
- How OES generates Physics resources without using official copyrighted past papers
Who this is for
- Students revising Energy as part of GCSE Physics
- Anyone retaking GCSE Physics who needs a focused review of Energy
- Parents and tutors supporting Physics students on Energy
Learning objectives
By the end of this topic you should be able to:
- Identify energy stores and ways energy is transferred
- Apply the equations for kinetic, gravitational and elastic potential energy
- Calculate work done and power, including unit conversions
- Calculate efficiency from energy or power figures
- Interpret and complete Sankey diagrams
- Evaluate renewable and non-renewable energy resources
Common mistakes
- Confusing power (W) with energy (J)
- Forgetting the ½ in ½mv² or ½ke²
- Using g = 10 instead of 9.8 unless the question allows it
- Writing efficiency as greater than 100% — this is impossible
- Listing renewable advantages without evaluating against the specific situation
Revision tips
- Memorise the eight energy stores and four transfer methods as a single diagram
- Drill 5 KE/GPE/EPE problems per session — they are the highest-frequency calc questions
- Practise Sankey diagram questions on at least three different scenarios
- Use flashcards on each renewable resource (advantages, disadvantages, when to use it)
- Always check units and conversions (kW to W, km to m, minutes to seconds) at the start of every calculation
How OES helps
AI Revision Notes
Concise, spec-aligned notes for every Physics topic, written to match what examiners reward.
Smart Flashcards
Adaptive Physics flashcards that prioritise the cards you keep forgetting using spaced repetition.
Exam-Style Papers
AI-generated Physics practice papers in the style of real exams — not official copyrighted past papers — with mark-scheme aware feedback.
Personal AI Study Coach
A 24/7 coach that plans every Physics session, explains anything you ask and adapts to your weakest topics.
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Frequently asked questions
Is Energy on every GCSE Physics specification?
Yes. Energy is a core part of the GCSE Physics specification across AQA, Edexcel and OCR. Some boards weight sub-topics slightly differently, but the content on this page maps to all three.
How long should I spend revising Energy?
Most students need 4–6 focused sessions to feel confident on Energy: one for the notes, one or two for flashcards, and two for exam-style questions. The AI Study Coach can build a schedule for you that fits the time you have left before the exam.
Does OES use official Physics past papers for Energy questions?
No. OES does not redistribute official copyrighted past papers. We generate fresh exam-style questions in the style of real AQA, Edexcel and OCR papers, marked against the published mark scheme conventions.
What are the most common mistakes on Energy questions?
Confusing power (W) with energy (J) Forgetting the ½ in ½mv² or ½ke² The full list — and how to avoid each — is in the "Common mistakes" section above.
Is this topic harder for higher-tier or foundation students?
Most of Energy is on both tiers. Higher-tier papers add a few stretch sub-topics and more demanding command words ("evaluate", "explain in detail"). The OES content is tier-aware — questions can be generated at foundation, higher or mixed difficulty.
How do I know if I've actually understood Energy, not just memorised it?
The fastest test is to attempt a fresh exam-style question and self-mark it against the mark scheme. If you can hit every mark point in your own words, you understand it. If you keep dropping the same marks, the AI Study Coach can target those gaps directly.
Where should I go next after Energy?
Related topics like electricity, particle model, waves build directly on Energy, so they are a strong next step. You can also drill Physics exam-style papers to combine Energy with everything else you have revised.
Ready to start?
Jump straight into the OES tools built for this topic.
Revise Energy with the AI Study Coach