The principle of operation of transformer is -

The correct answer is Faraday's law because transformers operate based on the principles of electromagnetic induction, which is described by Faraday's law.

Faraday's law states that a change in the magnetic field within a coil of wire induces an electromotive force (EMF) in the coil. In a transformer, when alternating current passes through the primary coil, it creates a changing magnetic field that induces a voltage in the secondary coil. This process allows the transformer to increase or decrease voltage levels efficiently.

Here's a brief overview of the other options:

    
• Ohm's Law: Relates voltage, current, and resistance in electrical circuits but does not explain transformer operation.
    
• Ampere's Law: Relates magnetic fields to electric current but is not the fundamental principle of transformer action.
    
• Lenz's Law: Addresses the direction of induced currents but is not the primary principle governing the operation of transformers.

Thus, Faraday's law is the foundational principle that explains how transformers work.

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