What is the primary working principle behind the functioning of a common household transformer used for stepping down voltage?

💡 Solution & Explanation

A transformer operates on the principle of mutual induction, where a changing magnetic flux in the primary coil induces an electromotive force in the secondary coil due to their electromagnetic coupling. Self induction occurs in single coil chokes but does not form the core transformation mechanism. Eddy currents represent energy losses rather than the intended working principle. Thermionic emission applies to vacuum tubes rather than electromagnetic transformers. Laminated iron cores are specifically utilized in transformers to minimize core losses caused by eddy currents.