An electrical transformer with a single winding where the input and output share the same coil, allowing voltage adjustment with high efficiency.
From auto- (self) + transformer (from Latin transformare). In electrical engineering, 'auto' refers to the single winding using itself for both primary and secondary circuits.
Autotransformers are sneaky efficient—by reusing the same coil for input and output, they're lighter and cheaper than regular transformers, making them perfect for voltage regulation in everything from your phone charger to industrial equipment.
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