This key facts covers Key Facts Summary within Electrical Power & Energy for GCSE Physics. Revise Electrical Power & Energy in Electricity for GCSE Physics with 15 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 8 of 15 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 8 of 15
Practice
15 questions
Recall
30 flashcards
📋 Key Facts Summary
- Power equations: P = IV, P = I²R, P = V²/R
- Energy equation: E = Pt or E = IVt
- Billing equation: Energy (kWh) = Power (kW) × time (hours)
- Cost: Cost = Energy (kWh) × price per unit
- Power unit: watts (W)
- 1 kW = 1000 W
- 1 kWh = 3,600,000 J = 3.6 × 10⁶ J
- Higher power + longer time = more energy used = higher bill