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Transformers come in very wide range of sizes from a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units weighing hundreds of tons used to interconnect portions of power grids. All operate with the same basic principles. Transformers can be found in nearly all electronic devices designed for household voltage. A major application of large scale transformers is to increase voltage before transmitting electrical energy over long distances through wires. Transformers are also used extensively in electronic products to step down the supply voltage to a level suitable for the low voltage circuits they contain. The transformer also electrically isolates the end user from contact with the supply voltage.