Signedon nameplate: UNITED TRANSFORMER CORP. NEW YORK / TYPE LS-7 / MADE IN UNITED STATES of AMERICA
FunctionA transformer makes use of inductively coupled conductors -- the transformer's coils or "windings" -- to change voltages. AC power running through the primary coil can be "stepped up" or "stepped down" depending on the ratio of number of windings in the two coils.