An autotransformer is a type of electrical transformer that uses a single, continuous winding for both the primary and secondary circuits. Unlike a conventional transformer, which has separate primary and secondary windings, an autotransformer shares a portion of its winding between the input and output circuits. This design allows for a more compact and efficient device, making autotransformers particularly useful in applications where space and efficiency are critical. https://www.steptransformer.com/autotransformers.html