Figure 1: The three power equations and the energy equation — all derived from P = IV and V = IR.
This diagram covers Electrical Power Formulas 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 4 of 15 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
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.