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Learning objective

Differentiate between direct current (d.c.) and alternating current (a.c.).

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

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

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Quick explanation

Differentiate between direct current (d.c.) and alternating current (a.c.)

  • This point belongs to Electrical quantities, especially Electrical quantities outcomes.
  • You need to be able to differentiate between direct current (d.c.) and alternating current (a.c.).
  • The key ideas to know are State.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

State

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

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Paper 3 structured question: Electrical quantities

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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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