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What Is A Transformer?
From the original power source, such as the utility generator, transformers of medium- to high-voltage are used to step up or to step down voltage for the most efficient and cost-effective transmission of electrical energy. They can be found in utility switchyards, on power poles, in shopping centers, schools, manufacturing and process plants and more. Proper maintenance of transformers is critical, and proper preparation for re-application is no less critical.
A transformer transfers electrical energy from one circuit to another through inductively coupled conductors — the transformer's coils. A varying current in the first or primary winding creates a varying magnetic flux in the transformer's core and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF), or "voltage," in the secondary winding. This effect is called mutual induction.