Exam-style question
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Explain how a transformer operates using the concept of changing magnetic flux.
Model answer
What a good answer should say
- A transformer operates on the principle of electromagnetic induction, where a changing magnetic flux in the primary coil induces an electromotive force (emf) in the secondary coil.
- This is due to Faraday's law of induction, which states that the induced emf is proportional to the rate of change of magnetic flux.
Explanation
Why this works
This answer is strong because it clearly links the operation of a transformer to the fundamental principle of electromagnetic induction, demonstrating an understanding of the key concepts involved. The question tests the student's ability to connect theoretical principles to practical applications in transformers.
Common mistake
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