Exam-style question
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What is the principle behind the operation of a transformer?.
- A.Conservation of energy in electrical circuits
- B.Changing magnetic flux induces an electromotive force (emf)
- C.Direct current flows through the primary coil
- D.The resistance of the coils determines the output voltage
Model answer
What a good answer should say
- Changing magnetic flux induces an electromotive force (emf)
Explanation
Why this works
The operation of a transformer is based on the principle that a changing magnetic flux in the primary coil induces an electromotive force (emf) in the secondary coil, allowing for voltage transformation.
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