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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Electrical quantities

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Electrical quantities

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Paper 3Theory (Core)3 marks

Understanding the differences between d.c. and a.c. is essential in electrical engineering.

Description

Direct Current vs Alternating Current

Direct current (d.c.) flows in one direction, while alternating current (a.c.) changes direction periodically. D.c. is used in batteries, whereas a.c. is used in power supplies.

  1. a

    Compare the characteristics of direct current and alternating current.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Electrical quantities

Paper 3Theory (Core)2 marks

Description

Applications of d.c. and a.c.

Direct current is commonly found in electronic devices, while alternating current is used for power distribution in homes.

  1. a

    Explain why alternating current is preferred for power distribution.

    Aim for approximately 2 distinct marking points.

    [2]