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Selected topic Power: watts and energy per second Science · Energy · view full details

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Science·Energy·conceptual

Power: watts and energy per second

Define power as the rate of energy transfer (power = energy ÷ time, measured in watts), and compare energy transfer rates in different everyday contexts

Suggested ages 12–13

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Evidence of understanding

States the definition of power and gives its unit (watt)
Uses P = E/t to calculate power, energy, or time given the other two quantities
Compares the power ratings of common appliances and explains what the rating means
Explains why a higher-powered device does the same job faster but uses more energy

Assessment prompt

If Power: watts and energy per second was comparing a 100 W light bulb with a 10 W LED, could they explain what those numbers mean and calculate how much energy each uses in an hour?

Standards alignment

KS3.Sci.Phys.Energy.4GB · uk-nc-2013

Power and Energy Transfer

The national curriculum in England: Key stages 1 and 2 framework document · KS3