Transformer

n.
  1. One who, or that which, transforms. Specif. (Elec.), an apparatus for producing from a given electrical current another current of different voltage.
    2. Multiple transformer
    1. A transformer connected in multiple or in parallel with the primary circuit.
    2. A transformer with more than one primary or more than one secondary coil.
    Parallel transformer (Elec.),
    a transformer connected in parallel.