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Converter, Adapter, Modifier, Alterer, Transmuter

A device in the ballast that transforms electric current from one voltage to another.

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Merriam-Webster Online Dictionary
transformer (noun)
one that - transforms , specifically a device employing the principle of mutual induction to convert variations of current in a primary circuit into variations of voltage and current in a secondary circuit
Transformer (Wikipedia)

In electrical engineering, a transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit, or multiple circuits. A varying current in any coil of the transformer produces a varying magnetic flux in the transformer's core, which induces a varying electromotive force (EMF) across any other coils wound around the same core. Electrical energy can be transferred between separate coils without a metallic (conductive) connection between the two circuits. Faraday's law of induction, discovered in 1831, describes the induced voltage effect in any coil due to a changing magnetic flux encircled by the coil.

Transformer
An O-core transformer consisting of two coils of copper wire wrapped around a magnetic core
Component typePassive
Working principleElectromagnetic induction
InventorMichael Faraday
Invention year1831
Electronic symbol

Transformers are used to change AC voltage levels, such transformers being termed step-up or step-down type to increase or decrease voltage level, respectively. Transformers can also be used to provide galvanic isolation between circuits as well as to couple stages of signal-processing circuits. Since the invention of the first constant-potential transformer in 1885, transformers have become essential for the transmission, distribution, and utilization of alternating current electric power. A wide range of transformer designs is encountered in electronic and electric power applications. Transformers range in size from RF transformers less than a cubic centimeter in volume, to units weighing hundreds of tons used to interconnect the power grid.

Transformer (Wiktionary)

English

Alternative forms

  • tformer, t-former (shortening)
  • transformator (archaic)

Etymology

From transform +‎ -er.

Pronunciation

  • (General American) IPA(key): /tɹænsˈfɔɹmɚ/
  • (Received Pronunciation) IPA(key): /tɹænsˈfɔːmə/, /tɹɑːnsˈfɔːmə/
  • Hyphenation: trans‧form‧er

Noun

transformer (plural transformers)

  1. Something that transforms, changing its own or another thing's shape.
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