This key facts covers Key Facts — 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 6 of 12 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 6 of 12
Practice
14 questions
Recall
25 flashcards
📋 Key Facts — Power
- Power = Energy / Time (P = E/t) or Power = Work done / Time (P = W/t)
- Unit of power: watt (W), where 1 W = 1 J/s
- Electrical power: P = IV, P = I²R, P = V²/R
- Energy consumed: E = Pt (in joules) or Energy (kWh) = Power (kW) × Time (h)
- Higher power = energy transferred more quickly, not necessarily more total energy
- A 60 W bulb on for 10 hours uses the same energy as a 600 W appliance on for 1 hour
- Power is a scalar quantity (no direction)