Transformers are electrical devices that use the principle of electromagnetic induction to change the AC voltage. It consists of at least two coils wound around the same iron core, one of which is connected to a power source and is called a primary winding; The other coil is connected to the load and is called the secondary winding. When alternating current passes through the primary winding, an alternating magnetic field is generated in the iron core, which in turn induces electromotive force in the secondary winding, thereby achieving voltage transformation. The design principle of transformers enables them to efficiently increase or decrease voltage, with minimal energy loss under ideal conditions. According to different application requirements, transformers can be divided into various types such as power transformers, audio transformers, pulse transformers, etc.

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