Transformers

A transformer is a simple, static device that transfers electrical energy from one circuit to another, according to Faraday’s Law of Induction, with no direct electrical connection. A transformer consists of a ferromagnetic iron or steel core around which two coils of wire are wound. The core provides a restricted path for the lines of force associated with the magnetic field, also known as magnetic flux, generated by the transformer. Typically, the transformer manufacturer constructs the core from thin layers of iron or steel to prevent overheating. Productpilot.com provides businesses access to those dealing in transformers.

When an alternating current is applied to the primary coil, the alternating magnetic field produced causes or induces an alternating voltage in the secondary coil. The alternating voltage in the secondary coil, in turn, induces an alternating current in a circuit connected to it. The process by which the primary coil magnetically induces a voltage in the secondary coil is called mutual induction.

By varying the number of turns of wire on the primary coil relative to the number of turns of wire on the secondary coil, the transformer manufacturer can dictate the voltage available in the secondary coil. By applying fewer turns of wire to the primary coil, the transformer manufacturer can create a step-up transformer, which increases the voltage available in the secondary coil relative to the primary coil. Conversely, by applying more turns of wire to the primary coil, the transformer manufacturer can create a step-down transformer, in which the reverse is true. A transformer supplier may quote this ratio of transformation, or turns ratio, in transformer specifications.

Transformers are used throughout electronics and, particularly, in mains power supplies. A typical transformer manufacturer will produce items to reduce the incoming mains voltage to the much lower voltage required by modern electronic devices. In so doing, the transformer producer also isolates the secondary supply from the mains supply, reducing the risk of electric shock. Productpilot.com provides a forum for industry professionals.

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