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Learning objective

Describe how trip switches and fuses function, and select suitable fuse ratings and trip switch settings (knowledge of RCDs is not included).

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

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Exam focus

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

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Quick explanation

Describe how trip switches and fuses function, and select suitable fuse ratings and trip switch settings (knowledge of RCDs is not included)

  • This point belongs to Electrical safety, especially Electrical safety outcomes.
  • You need to be able to describe how trip switches and fuses function, and select suitable fuse ratings and trip switch settings (knowledge of RCDs is not included).
  • The key ideas to know are Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Explain

Why it matters

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

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Paper 3 structured question: Electrical safety

Paper 3Theory (Core)2 marks

Description

Electrical Safety Devices

Fuses and trip switches are commonly used in household electrical systems to enhance safety. Fuses melt to break the circuit during overloads, while trip switches automatically disconnect the circuit when a fault is detected.

  1. a

    Describe the function of fuses and trip switches in electrical circuits.

    Aim for approximately 2 distinct marking points.

    [2]
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Cambridge IGCSECombined Science resources