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Cambridge AS & A Level Physics

21Alternating currents

Alternating currents in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Lessons

  • Alternating current: period, peak and r.m.s. values

    40 min

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  • Rectification and smoothing

    40 min

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Sample question

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Alternating currents: sample question

1 mark

A sinusoidal alternating voltage has a peak value of 17 V. What is its r.m.s. value?

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