English National Curriculum Science

5. Explore power

Mission Objectives

Recall the two equations for calculating power and the units involved

Describe, using examples, what is meant by power

Calculate power using energy transferred or work done

Compare the power of different appliances or machines

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KS4-18-05 Lesson Slides KS4-18-05 Mission Assignment KS4-18-05 PDF Handout KS4-18-05-Teacher Answers KS4-18-05 Handout

Keywords

Words and meanings to learn

transfer

the conversion of one form of energy into another, or the movement of energy from one place to another

megajoule (MJ)

a unit of work or energy, equal to one million joules

kilowatt (kW)

a unit of power. 1 kW is equal to 1000 watts

conversion

a change between different units of measurement for the same quantity

rearrange

change the subject of an equation. When using equations whatever is done to one side of an equals sign must be done to the other also.

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United Kingdom National Nuclear Laboratory

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Required Resources

Resources: Class presentation and handout.

Handout: Information on James Watt for historical context. Definition of power and model calculation. Practice calculation for power, including changing units and the subject of the equation. Practice converting SI units.

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