Study Hub

Study Guides

This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.

Back to Study HubBrowse Year 10 Science Guides

Year 10 - Science

Efficiency (in terms of useful energy transferred)

Energy of moving objects

Unit Summary

This unit covers energy changes in systems through heating, forces, and electrical work. It includes energy storage, efficiency, and transfer methods like insulation. Emphasis is on calculating energy, conducting experiments, interpreting data, and communicating findings accurately.

Lesson Summary

You will learn to calculate the efficiency of an energy transfer and describe ways in which energy is dissipated.

Key Notes

  • Energy is dissipated due to friction which causes particles to vibrate more quickly and heats up the surroundings.
  • Energy is dissipated due to drag which causes particles in the surroundings to move more quickly.
  • Efficiency = (useful energy transferred by the device)/(total energy supplied to the device)

Vocabulary To Learn

  • dissipate: Friction can cause energy to dissipate (spread out and become unusable) into the surroundings, causing them to heat up.
  • efficiency: Efficiency is the fraction of energy supplied to an object or system that is usefully transferred by it.
  • useful energy transferred: The amount of energy usefully transferred by an object or system is the useful energy transferred by the device.
  • total energy supplied: The total amount of energy transferred to an object or system is the total energy supplied to the device.

Common Mistakes To Avoid

  • Pupils may not realise that energy transfers usually result in the heating of the surroundings and therefore some energy ends up in a thermal store.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Energy is dissipated due to friction which causes particles to vibrate more quickly and heats up the surroundings. Energy is dissipated due to drag which causes particles in the surroundings to move more quickly.

2. Define this scientific word and use it in context. 'dissipate'

Friction can cause energy to dissipate (spread out and become unusable) into the surroundings, causing them to heat up. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupils may not realise that energy transfers usually result in the heating of the surroundings and therefore some energy ends up in a thermal store. Correction: Pupils should have opportunity to identify and describe places in a system where energy is dissipated and transferred into a thermal store.

More Lessons In This Unit

Browse all guides in the Year 10 Science guide library.