Transformers — A/L Physics

How do I practise Transformers?

1 question with a worked solution

1. Why is the soft iron core of an electrical power transformer constructed using thin, mutually insulated laminations rather than a solid iron block?
   1. A) To increase the secondary turns ratio
   2. B) To minimize energy losses caused by induced eddy currents
   3. C) To eliminate magnetic hysteresis loss entirely
   4. D) To shield the transformer from external electrostatic charge
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   Correct answer: B) To minimize energy losses caused by induced eddy currents

   Alternating magnetic flux in the core induces circulating eddy currents in the iron, dissipating electrical energy as heat (I²R loss). Laminating the core breaks the closed conductive loops, drastically increasing electrical resistance to eddy currents and minimizing energy loss.

   Show worked solution

   Step 1: Identify transformer loss mechanisms: Hysteresis loss (minimized by soft iron), Eddy current loss (minimized by lamination). Answer: To minimize energy losses caused by induced eddy currents.
   Modelled on: the A/L Physics examination pattern

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Where does Transformers fit in the syllabus?

Unit 8.6 · Year 2 · Term 1