An autotransformer functions based on the principle of:

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An autotransformer operates on the principle of self-induction, which involves the generation of an electromotive force (EMF) in a coil due to the change in current in the same coil. In a self-induced transformer, the primary and secondary circuits share a single winding, allowing the transformer to adjust the voltage without needing a traditional two-winding configuration. This allows for a variable output voltage based on how the tapping on the winding is set, facilitating precise control over the voltage supplied to the output.

This principle is different from mutual induction, where two separate coils induce voltage into one another, which is the standard operation for conventional transformers. The unique design of autotransformers makes them more efficient for certain applications where voltage needs to be adjusted within a single system, as they can reduce energy losses compared to traditional transformers while maintaining the required output.

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