A transformer is a device used for converting an alternating electric current from one voltage to another, depending upon electro-magnetic induction. The first transformer was made by Faraday in 1831.

Np = number of turns in primary coil.
Ns = number of turns in secondary coil.
Vp = voltage across primary coil [V].
Vs = voltage across secondary coil [V].

Air Blast Transformer

A transformer cooled by forcing a circulation of air around its windings.


A transformer in which both primary and secondary coils, have turns in common. The step up or step down of voltage, is accomplished by taps in common windings.


The centre part of an inductor or transformer around which wire is wound. Cores are typically composed of laminated steel, ferrite material, or a hollow dielectric tube, i.e., an air core.

Potential Transformer

A voltage transformer. The voltage supplied to a primary coil induces a voltage in a secondary coil according, to the ratio of the wire windings in each of the coils.

Turns Ratio

The ratio of primary-to-secondary turns of a transformer.

Utility Transformer

Primary and secondary coils of wire which reduce (step down) the utility supply volt age for use within a facility.

See also: Bifilar Winding, Current Transformer, E-Transformer, Hysteresis Loss, Laminated Core, Mutual Flux, Planar Power Transformer, Potential Transformer, Primary Winding, Rf Transformer, Secondary Coil, Step Down Transformer, Step Up Transformer, Transformer Efficiency, Transformer Oil, Turn, Turns Ratio, Universal Output Transformer, Utility Transformer, Volt.

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Subjects: Electronics Physics