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.
📊 Electrical Power Formulas
Figure 1: The three power equations and the energy equation — all derived from P = IV and V = IR.
Practice questions for Electrical Power & Energy
What is the unit of electrical power?
Explain why the National Grid transmits electricity at high voltage to reduce energy losses.
Quick recall flashcards
What is 1 watt?
1 joule of energy transferred per second (1 W = 1 J/s)
Unit of power?
Watt (W) or joules per second (J/s)