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Recall and apply the relationships for a metallic conductor: (a) resistance is directly proportional to length, and (b) resistance is inversely proportional to cross-sectional area.

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Cambridge IGCSE PhysicsElectricity and magnetismSupplement content

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Recall and apply the relationships for a metallic conductor: (a) resistance is directly proportional to length, and (b) resistance is inversely proportional to cross-sectional area

  • This point belongs to Resistance, especially Resistance outcomes.
  • You need to be able to recall and apply the relationships for a metallic conductor: (a) resistance is directly proportional to length, and (b) resistance is inversely proportional to cross-sectional area.
  • 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.

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RecallUse

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Paper 4 structured question: Resistance

Paper 4Theory (Extended)1 marks

Description

Resistance in Conductors

A metallic conductor has a length of 2 meters and a cross-sectional area of 1 mm². If the length is increased to 4 meters while keeping the area constant, what will happen to the resistance?

  1. a

    State the effect on resistance when the length is increased to 4 meters.

    Aim for approximately 1 distinct marking point.

    [1]
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