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Cambridge IGCSE Physics

1.7Energy, work and power

Energy, work and power in Cambridge IGCSE Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic66 practice questions6 lessons

In this topic

Lessons

  • Energy stores, transfers and conservation

    25 min

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  • Kinetic and gravitational potential energy

    20 min

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  • Work done

    20 min

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  • Efficiency

    20 min

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  • Energy resources and electricity generation

    30 min

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  • Power

    16 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Energy, work and power: sample question

1 mark

A light bulb is supplied with 200 J200\ \text{J} and gives out 50 J50\ \text{J} as light. Calculate its efficiency.

Answer in %.

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