This exam tips covers Exam Tips for Power within Power for GCSE Physics. Revise Power in Energy for GCSE Physics with 14 exam-style questions and 25 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 11 of 12 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 12
Practice
14 questions
Recall
25 flashcards
💡 Exam Tips for Power
🎯 Common Question Types:
- Calculate power from energy and time (2 marks)
- Calculate electrical energy cost in kWh and pence (3-4 marks)
- Rearrange P = E/t to find E or t (2 marks)
- Use P = IV for electrical circuits (2 marks)
- Compare power ratings of appliances (1-2 marks)
📝 Key Command Words:
- Calculate: Show all steps — write formula, substitute, give answer with units
- State: Give the definition or unit of power without explanation
- Explain: Give the reason with reference to the equation (e.g., "higher power means more energy per second because P = E/t")
- Compare: Identify which appliance has higher/lower power and what that means
⚠️ Common Mistakes to Avoid:
- Forgetting to convert minutes or hours to seconds when using P = E/t
- Mixing up energy (J) and power (W) in your answer
- Using kW instead of W in the main equation P = E/t (must use SI units)
- Forgetting that kWh is a unit of energy, not power