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Learning objective

Know that the total resistance of two resistors connected in parallel is lower than the resistance of either resistor alone.

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

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE Combined ScienceElectricityCore content

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Quick explanation

Know that the total resistance of two resistors connected in parallel is lower than the resistance of either resistor alone

  • This point belongs to Electrical circuits, especially Electrical circuits outcomes.
  • You need to be able to know that the total resistance of two resistors connected in parallel is lower than the resistance of either resistor alone.
  • The key ideas to know are State and Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

StateExplain

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

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Paper 3 structured question: Electrical circuits

Paper 3Theory (Core)2 marks

Description

Parallel Resistor Circuit

In a circuit with two resistors, R1 = 5Ω and R2 = 10Ω, connected in parallel, calculate the total resistance.

  1. a

    Calculate the total resistance of the circuit.

    Aim for approximately 2 distinct marking points.

    [2]
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