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Cambridge IGCSE Physics practice

Paper 4 structured question: The a.c. generator

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Topic

The a.c. generator

Exam-style question

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Paper 4Theory (Extended)1 marks

A student is studying the behavior of an A.C. generator.

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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Paper 4 structured question: The a.c. generator

Paper 4Theory (Extended)4 marks

Description

Sinusoidal e.m.f. Graph

The graph shows the e.m.f. generated by the A.C. generator over one complete cycle.

  1. a

    Explain the significance of the zero points on the e.m.f. graph.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Determine the orientation of the coil when the e.m.f. is at a trough.

    Aim for approximately 2 distinct marking points.

    [2]