Variac a type of transformer that transfers electrical energy from one
circuit to another circuit. It is used for testing voltage of
electronic*appliances, controlling heat of ovens and heaters, testing
voltmeters and other meters. Different types of
variable*transformers*are available in the market like open type
variable transformer, enclosed variable transformer, single phase
variable*transformer and three phase variable*transformer.

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I wish I still had my little green variac from the old computer store...