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Learning objective

Clarify that the total current entering a junction is equal to the total current exiting the junction.

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

Clarify that the total current entering a junction is equal to the total current exiting the junction

  • This point belongs to Series and parallel circuits, especially Series and parallel circuits outcomes.
  • You need to be able to clarify that the total current entering a junction is equal to the total current exiting the junction.
  • The key ideas to know are Explain and Understand.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

ExplainUnderstand

Why it matters

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

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Paper 4 structured question: Series and parallel circuits

Paper 4Theory (Extended)1 marks

Description

Current Flow in a Circuit

In a circuit, three wires meet at a junction. Wire A carries 2 A, Wire B carries 3 A, and Wire C is unknown. Determine the current in Wire C.

  1. a

    State the current in Wire C.

    Aim for approximately 1 distinct marking point.

    [1]
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