— Transformer Operation. a SSS revwwOOr

—r— forming alternating currents, usually, of small quantity and high pre ure into currents of large quantity and low pre ure: it consists e entially, of two coils of insulated wire wound adjacently upon a soft iron core; the primary coil of high resistance consisting of many turns of fine wire is connected to the high potential circuit, and the secondary coil, consisting of fewer turns of coarse wire, furnishes the current at a reduced pre ure; the alternating current transformer. This is a “step down’’ transformer; in a “step up” transformer the conditions © are reversed, viz.: The primary winding being made up of a few turns of coarse wire and the secondary winding, of many turns of fine wire.