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Learning objective

Remember and apply the formula for two resistors functioning as a potential divider: R1/V1 = R2/V2.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE PhysicsElectricity and magnetismSupplement content

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Quick explanation

Remember and apply the formula for two resistors functioning as a potential divider: R1/V1 = R2/V2

  • This point belongs to Action and use of circuit components, especially Action and use of circuit components outcomes.
  • You need to be able to remember and apply the formula for two resistors functioning as a potential divider: R1/V1 = R2/V2.
  • The key ideas to know are Recall and Use.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

RecallUse

Why it matters

This objective helps connect Action and use of circuit components outcomes to exam-style questions, flashcards, and revision notes for Action and use of circuit components.

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Practice Questions7 linked questions

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Paper 4 structured question: Action and use of circuit components

Paper 4Theory (Extended)1 marks

Description

Potential Divider Circuit

In this circuit, R1 = 2Ω and R2 = 3Ω. Calculate the voltage across R1 (V1) and R2 (V2).

  1. a

    State the formula used to calculate V1 in a potential divider.

    Aim for approximately 1 distinct marking point.

    [1]
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