This memory aid covers Memory Aid 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 11 of 15 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
🧠 Memory Aid
Three power equations from one — "PIV is like PIE":
Start with P = IV (the PIE). To get P = I²R: replace V with IR (from Ohm's Law). To get P = V²/R: replace I with V/R. You only need to remember P = IV and V = IR, then derive the others.
kWh billing — "kW × Hours = kWh":
Kilowatts × Hours = Kilowatt-Hours. The unit tells you exactly what to multiply. If given watts, divide by 1000 first. If given time in minutes, divide by 60 first.
Which equation? — "Got V and I? Use P = VI. Got I and R? Use I²R. Got V and R? Use V²/R":
Match the letters in the equation to the letters of the quantities you've been given in the question.
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.