Voltage transformer is a device that electrical energy through two or more windings, and through the induction of electric from one circuit to Circuit, other pass. This means that the flow of current in the first circuit (the primary of the transformer), thereby creates a magnetic field around the coil first. this magnetic field in turn causes the coming into being of a voltage in the Second Circuit that by adding a load to the second circuit, this voltage can create a current in the secondary degradation.