Exam Favourite
Examined in Edexcel 1PH0/2 (Paper 2). Context-based: household appliance energy cost calculations are a staple question type. Edexcel emphasises energy cost using E = Pt and unit price. Electrical power and energy appears on almost every paper. Expect calculation questions, unit conversions, and "explain" questions about energy efficiency.
What examiners love to ask:
- Calculate power using P = IV, P = I²R, or P = V²/R
- Calculate energy transferred using E = Pt
- Calculate running cost using E = P(kW) × t(hours) × price
- Explain why the National Grid uses high voltage (Higher tier)
- Compare running costs of two appliances
- Choose the correct power equation given different known quantities
This exam focus covers Exam Focus 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 topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 13 of 15 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Electrical Power & Energy
What is the unit of electrical power?
A television has a power rating of 120 W and is left on for 3 hours. Calculate the energy transferred by the television in this time. Use the equation: energy transferred = power x time. Give your answer in joules.