Principle of transformer is ?
Correct answer: A. Mutual inductance
- A. Mutual inductance
- B. Self-induction
- C. Motional emf
- D. None of these
Explanation
Correct option is A. Principle of transformer is Mutual Induction. When a transformer primary has alternating current flowing in the conductor, magnetic flux surrounds the conductor in proportion to the amount of the current. The expanding and contracting flux cuts the conductors in the secondary and induces a voltage in the secondary. A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. It can be designed to "step up" or "step down" voltages and works on the magnetic induction principle.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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