The voltage rises or falls.
1. The voltage input side is the high-voltage terminal and the output side is the low-voltage terminal. Such a transformer is a step-down transformer.
2. The voltage input side is the low-voltage side and the output side is the high-voltage side. Such a transformer is a step-up transformer.
3. The step-up transformer is used to step up the voltage, and the step-down transformer is used to step down the voltage.
Extended information:
Faraday invented an "inductor loop" on August 29, 1831, called the "Faraday Induction Coil", which was actually the world's first transformer. prototype. But Faraday only used it to demonstrate the principle of electromagnetic induction and did not consider its practical use.
After Westinghouse engineer William Stanley purchased the transformer patent from George Westinghouse, Lucien Golar and John Dixon Gibbs, in 1885 Made the first practical transformer. Later, the core of the transformer was formed by laminating E-shaped iron sheets and began commercial use in 1886.
The transformer is composed of an iron core (or magnetic core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the remaining windings are called secondary coils. It can transform AC voltage, current and impedance.
The core loss of the transformer has a great relationship with the frequency, so it should be designed and used according to the frequency of use. This frequency is called the operating frequency.
Transformation ratio refers to the voltage ratio or current ratio, which is a device for converting voltage or current, the voltage or current ratio between the primary winding and the secondary winding. In a transformer, the ratio of the primary side electromotive force E1 to the secondary side E2 is called the transformation ratio of the transformer, represented by k, that is, k=E1/E2.
The ratio of the input voltage of the primary winding to the output voltage of the secondary winding is equal to their turns ratio. The ratio K is called the transformation ratio coefficient.
Reference material: Baidu Encyclopedia-Transformer
Reference material: Baidu Encyclopedia-Transformer ratio