Power — GCSE Physics Revision
Revise Power for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to EfficiencyWhat is Power?
Power is the rate at which work is done, or the rate at which energy is transferred. It is measured in Watts (W), where 1 Watt is equal to 1 Joule of energy transferred per second. A more powerful machine can do the same amount of work in less time.
Board notes: Covered by all major boards (AQA, Edexcel, OCR) at both Foundation and Higher tiers.
Step-by-step explanationWorked example
A crane lifts a 500N weight by 10m in 20s. Calculate the power of the crane. Solution: First, calculate the work done: Work Done = Force x Distance = 500N x 10m = 5000J. Then, calculate the power: Power = Work Done / Time = 5000J / 20s = 250W.
Mini lesson for Power
1. Understand the core idea
Power is the rate at which work is done, or the rate at which energy is transferred. It is measured in Watts (W), where 1 Watt is equal to 1 Joule of energy transferred per second.
Can you explain Power without copying the notes?
2. Turn it into marks
A crane lifts a 500N weight by 10m in 20s. Calculate the power of the crane.
Underline the method, evidence, or command-word move that would earn credit in GCSE Energy.
3. Fix the likely mark leak
Watch for this mistake: Confusing power with energy or work done. Power is the rate of energy transfer, not the amount of energy.
Write one correction rule before doing another practice question.
Practise this topic
Jump into adaptive, exam-style questions for Power. Free to start; sign in to save progress.
Power practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Power is testing.
Answer: Power is the rate at which work is done, or the rate at which energy is transferred. It is measured in Watts (W), where 1 Watt is equal to 1 Joule of energy transferred per second.
Mark focus: Precise definition and topic focus.
Question 2
A Power question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing power with energy or work done. Power is the rate of energy transfer, not the amount of energy." What should their next repair task be?
Answer: Do one Power question and review the mistake type.
Mark focus: Error correction and next-step practice.
Power flashcards
Core idea
What is the main idea in Power?
Power is the rate at which work is done, or the rate at which energy is transferred. It is measured in Watts (W), where 1 Watt is equal to 1 Joule of energy transferred per second.
Common mistake
What mistake should you avoid in Power?
Confusing power with energy or work done. Power is the rate of energy transfer, not the amount of energy.
Practice
What is one useful practice task for Power?
Answer one Power question and review the mistake type.
Exam board
How should you use board notes for Power?
Covered by all major boards (AQA, Edexcel, OCR) at both Foundation and Higher tiers.
Common mistakes
- 1Confusing power with energy or work done. Power is the rate of energy transfer, not the amount of energy.
- 2Using the wrong units. Power is in Watts (W), work done in Joules (J), and time in seconds (s). Forgetting to convert time to seconds is a common error.
- 3Thinking that a high power rating always means a device is better. A high power rating means it uses energy more quickly, which may not always be desirable.
Power exam questions
Exam-style questions for Power with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Power
Core concept
Power is the rate at which work is done, or the rate at which energy is transferred. It is measured in Watts (W), where 1 Watt is equal to 1 Joule of energy transferred per second. A more powerful mac…
Frequently asked questions
What is the difference between power and energy?
Energy is the ability to do work, measured in Joules. Power is the rate at which energy is used or transferred, measured in Watts (Joules per second).
How do you calculate power?
Power can be calculated using the formula: Power (W) = Work Done (J) / Time (s).