Which of the following describes the working principle of a transformer?

💡 Solution & Explanation

A transformer operates on the fundamental principle of mutual induction where a changing current in the primary coil induces an electromotive force in the secondary coil via a shared magnetic core. Self-induction involves voltage induction within a single isolated coil due to its own changing current rather than across separate circuits. Transformers are indispensable devices for efficient long-distance transmission of alternating electrical power.