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A transformer used to step up or down the value of voltage.
The difference between current transformer and potential transformer is that the secondary of a current transformer can not be open circuited while under service whereas that of the potential transformer an be open circuited without any damage to the transformer.
the auto transformer is the one winding transformer. it ismaily used in practical purpose.
If the bed lamps use a low voltage bulb then the type of transformer will be a step down transformer.
in welding machine, the transformer used is basically a current transforrmer. so by changing the tap of secondary side of transformer, we can increase or decrease the current in the transformer.