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Learning objective

Draw and analyze graphs showing the relationship between electromotive force (e.m.f.) and time for basic a.c. generators, and connect the orientation of the generator coil to the e.m.f. peaks, troughs, and zero points.

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

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  • Practise with linked questions.
Cambridge IGCSE PhysicsElectricity and magnetismSupplement content

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Quick explanation

Draw and analyze graphs showing the relationship between electromotive force (e.m.f.) and time for basic a.c. generators, and connect the orientation of the generator coil to the e.m.f. peaks, troughs, and zero points

  • This point belongs to The a.c. generator, especially The a.c. generator outcomes.
  • You need to be able to draw and analyze graphs showing the relationship between electromotive force (e.m.f.) and time for basic a.c. generators, and connect the orientation of the generator coil to the e.m.f. peaks, troughs, and zero points.
  • The key ideas to know are Sketch, Explain, and Determine.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

SketchExplainDetermine

Why it matters

This objective helps connect The a.c. generator outcomes to exam-style questions, flashcards, and revision notes for The a.c. generator.

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Paper 4 structured question: The a.c. generator

Paper 4Theory (Extended)1 marks

Description

A.C. Generator Operation

The generator consists of a coil rotating in a magnetic field, producing an alternating current. The e.m.f. generated varies with the orientation of the coil.

  1. a

    State the orientation of the coil that produces maximum e.m.f.

    Aim for approximately 1 distinct marking point.

    [1]
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