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Short circuits and earth wires

Quiz by Oak National Academy: GCSE Combined Science AQA Foundation

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6 questions
Show answers
  • Q1
    Some electrical appliances have two layers of electrical insulation: the plastic around the wires, and an insulating outer casing. This is called ______ insulation.
    Users enter free text
    Type an Answer
    30s
  • Q2
    The diagram shows three electric circuits. How many of these have a short circuit?
    Question Image
    two
    all of them
    one
    none of them
    30s
  • Q3
    Which of the following statements about a circuit breaker are correct?
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    Sorting
    30s
  • Q4
    When does current flow in the earth wire of an appliance that has a metal outer casing?
    if the live wire comes loose and touches the metal casing
    always, whether the appliance is switched on or off
    if the earth wire comes loose and touches the metal casing
    whenever the appliance is running
    30s
  • Q5
    Which of the following is the earth wire of an appliance connected to?
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    Sorting
    30s
  • Q6
    Which of the following is the purpose of a fuse?
    It provides a low resistance path for current to flow to earth.
    It breaks the circuit if the current is too large.
    It is used as a switch to turn a circuit on and off.
    It creates a short circuit.
    30s

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