GCSE · Physics · AQA · Spec 8463
Power (P = E/t and P = W/t)
What is power? — the concept unfolded
Follow one unit of energy as it moves through a device. Notice where the 'rate' idea appears.
Stop and think
Commit to an answer before you reveal — this is the exact thinking the exam tests.
A 60 W lamp and a 600 W microwave both run for exactly 10 seconds. The microwave transfers how many times more energy than the lamp?
Power — the rate idea
Reason it through
Why does a higher-power device finish the same job in less time?
First link · your turn
What does a higher power rating actually tell you about each second of operation?
Relationship matrix
Tap any cell to reveal it. Tap a column header to read one property down every item.
Each cell hides a short answer and the reason behind it. Predict before you tap.
Cross-subject · Exam skill
AQA command words — Power questions
What AQA actually wants when it uses each command word on a power question
01Definition
Use a numerical method to produce an answer. Always show the equation used, the substitution, and the final value with its unit.
02Mark-band signal
Full marks require: equation stated or clearly implied, correct substitution, correct answer with unit (W, J, or s).
03Sentence stems
- Calculate the power of the device.
- Calculate the energy transferred in 30 seconds.
- Calculate the time taken to transfer 6000 J at a power of 200 W.
04Common mistake
Forgetting to convert minutes to seconds before dividing — always check the time unit is seconds before substituting.
Equations you need
Taken directly from the exam-board specification.
P = power (W) · E = energy transferred (J) · t = time (s)
Learn it — you must recall this in the exam
P = power (W) · W = work done (J) · t = time (s)
Learn it — you must recall this in the exam
WHAT YOU'VE LEARNED
A quick recap of today's lesson.
How fast energy is transferred — and how to calculate it
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