Transformers are integral parts of electronic devices because they transfer power between two separate parts of an electrical circuit. A transformer creates isolation while varying voltage and current. Power transformers are used when the need for high-efficiency power transfer is a requirement. Power transformers are designed to either operate non-continuously or continuously while at full capacity. These specialized transformers, like traditional transformers, are based on concepts of electromagnetic induction. All power transformers contain two magnetically coupled coils (primary and secondary windings).
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