Power
2 marks · EasyA bulb transfers 36 J of energy in 12 seconds. Calculate the power of the bulb.
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3 W (±0.1)
Also accept: 3 watts; 3
Common mistakes: Dividing the wrong way around (12/36); Missing units
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Marking points
M1 · 1 mark · Substitutes values into correct formula: P = E/t = 36/12
A1 · 1 mark · Final answer: 3 W
Worked solution
P = E / t