Autotransformers

Typical of this type of transformers is that they have only one coil with different connections for the primary and secondary voltages. Often, the autotransformer is implemented with a slider that allows a smooth control of output voltage. The advantages of this type of transformer are that - it is smaller, cheaper and with less losses of the transformers of the same power in a classic embodiment. The disadvantages are that there is a galvanic separation of the two sides, and should not be used as safety devices. 

 

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