ELECTRICAL POWER
2 marks · EasyAn electric heater is labelled 500 W. How much energy does it transfer in 8 seconds?
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4000 J (±1)
Common mistakes: 500 + 8 = 508; Dividing instead of multiplying
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Marking points
M1 · 1 mark · Recognises and uses E = P × t.
A1 · 1 mark · Correct answer: 4000 J. (follow-through)
Worked solution
Energy = power × time