Transformers are used to step up or step down voltage.(eg Regular household voltage is 110/120 volts and your cell phone charger requires 9 volts. A transformer is used to step down the voltage from 120 to 9 volts).
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TRANSFORMERS
An electric device consisting essentially of two or more windings wound on the same core, which by electromagnetic induction transforms electric energy from one set of one or more circuits to another set of one or more circuits such that the frequency of the energy remains unchanged while the voltage and current usually change.
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COPPER TRANSFORMERS
A Transformer, whose winding’s are made of strictly Copper, which transforms electric energy from one set of one or more circuits to another set of one or more circuits such that the frequency of the energy remains unchanged while the voltage and current usually change.