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ZIMSEC O-Level Physics

13.4Transformers

Transformers in ZIMSEC O-Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Overview

Form 4.

Learning objectives

What the syllabus expects you to be able to do.

  1. 13.4.1Describe the structure and principle of operation of a basic iron-cored transformer.
  2. 13.4.2Use the transformer equations Vp/Vs = Np/Ns and VpIp = VsIs.
  3. 13.4.3Describe the use of transformers in high-voltage transmission.
  4. 13.4.4Discuss energy losses in transformers and cables, including eddy currents and heating.
  5. 13.4.5Give the advantages of high-voltage transmission.

Lessons

  • Transformers and the transmission of electricity

    35 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Transformers: sample question

1 mark

A transformer has 400 turns on its primary coil and 2000 turns on its secondary coil. The primary voltage is 46 V. Calculate the secondary voltage.

Answer in V.

Turn Transformers into a strength.

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