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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Electrical safety

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Attempt questionElectrical safety revisionRevise the key idea

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4

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Topic

Electrical safety

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Paper 3Theory (Core)4 marks

Choosing the right fuse rating.

Description

Fuse Ratings

Selecting the correct fuse rating is essential for protecting electrical appliances. A fuse that is rated too high may not blow during an overload, while one that is rated too low may blow frequently during normal operation.

  1. a

    Evaluate the importance of selecting the correct fuse rating for household appliances.

    Aim for approximately 4 distinct marking points.

    [4]

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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]