English National Curriculum Science

6. Explore efficiency and reducing unwanted energy transfers

Mission Objectives

Describe energy transfers in a closed system using ideas about conservation of energy

Explain how energy can be dissipated in a system

Recall the equations and use them to calculate the efficiency of an energy transfer

Explain ways of reducing unwanted energy transfers

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KS4-18-06 Lesson Slides KS4-18-06 Mission Assignment KS4-18-06 Handout KS4-18-06-Teacher Answers KS4-18-06 PDF Handout

Keywords

Words and meanings to learn

incandescent

the emission of visible light from a hot object

watt

the unit for power. The power when 1 J of work is done in 1 s

thermal

relating to heat or changes in temperature

efficiency

a measure of how much energy is converted into a useful form

conductivity

a measure of how easily an electric current or thermal energy flows through a material

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United Kingdom National Nuclear Laboratory

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Required Resources

Resources: Class presentation and handout.

Handout: Information on Carnot and his work on machines for the students to read and summarise. Calculations on efficiency, including changing the subject of the equation. Discuss machines that are 100% efficient. Is this possible? Why not?

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