Level 4: Joules and watts

Energy and power · level 4 of 8 · rough age 11-12 (a guide for parents; anyone can start anywhere)

In this level you measure energy and power. You meet the joule and the watt, change between joules and the kilowatt-hours on an electricity bill, read the energy on a food label, work out the power of your own legs climbing stairs on Earth and on Mars, and compare the power of a Mars rover with a home on Earth.

Lesson	You will be able to
The joule	Use the joule as the unit of energy, and feel how big one is on Mars and on Earth
Power and the watt	Find power from energy and time, and give typical powers of everyday things
Kilowatt-hours	Change between kilowatt-hours and joules, and work out what an appliance uses
Energy in food	Read food labels in kJ and kcal, and find the power your body runs at
The power of a person	Work out your power climbing stairs, on Earth and on Mars
Rovers and their power	Compare the energy a rover has each sol with what a home uses each day

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