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Cambridge IGCSE Physics

1.7.4Power

Power in Cambridge IGCSE Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic10 practice questions1 lesson

Learning objectives

What the syllabus expects you to be able to do.

  1. 1.7.4.1Define power as work done, or energy transferred, per unit time and use P = W/t and P = ΔE/t.

Lessons

  • Power

    16 min

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Sample question

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

Power: sample question

1 mark

An electric iron transfers 36 000 J36\,000\ \text{J} of energy in 30 s30\ \text{s}. What is its power?

Answer in W.

Turn Power into a strength.

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