The transformer that operates on the principle of self-induction is the

The transformer that operates on the principle of self-induction is the

• A. Step-up transformer
• B. Step-down transformer
• C. Induction transformer
• D. Autotransformer

Answer: (D)

Self-induction is the process where a changing current in a conductor induces an EMF in the same conductor. An autotransformer uses a single winding with taps, so the primary and secondary circuits share the same coil. The voltage is produced by the changing current in that same winding, inducing the secondary voltage along the coil itself rather than across a separate secondary winding. Because energy transfer relies on self-induction within one winding, rather than mutual induction between two separate windings, the autotransformer is the example that fits this principle. This is why it’s used to provide different voltages by selecting different taps on the same winding.

Self-induction is the process where a changing current in a conductor induces an EMF in the same conductor. An autotransformer uses a single winding with taps, so the primary and secondary circuits share the same coil. The voltage is produced by the changing current in that same winding, inducing the secondary voltage along the coil itself rather than across a separate secondary winding. Because energy transfer relies on self-induction within one winding, rather than mutual induction between two separate windings, the autotransformer is the example that fits this principle. This is why it’s used to provide different voltages by selecting different taps on the same winding.