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Learning objective

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.

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

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  • Read the explanation.
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  • Practise with linked questions.
Cambridge IGCSE Combined ScienceElectricitySupplement content

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Quick explanation

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 Electrical quantities, especially Electrical quantities 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 Calculate.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Calculate

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This objective helps connect Electrical quantities outcomes to exam-style questions, flashcards, and revision notes for Electrical quantities.

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Paper 4 structured question: Electrical quantities

Paper 4Theory (Extended)2 marks

Description

Resistance of Wires

The student measures the resistance of both wires and records the results. Wire A has a resistance of 4 ohms, while Wire B has a resistance of 8 ohms.

  1. a

    Compare the resistances of Wire A and Wire B based on their lengths and cross-sectional areas.

    Aim for approximately 2 distinct marking points.

    [2]
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