t is an electrical machine, it lets to increase or decrease the voltage or tension in an electric circuit of alternating current, keeping the frequency in a constant level.
When the value of the electrical tension increases to get a bigger tension, the transformer is called step up transformer. On the contrary, when the tension value is reduced, it is called as step down transformer.
A transformer is used because of the energy that comes from the electrical center and it is transported hundreds of kilometers, it is not the one it is get in our offices and houses, inclusive a lot of times it is needed to adapt several special voltages for some production machines.

The components of a transformer:
- Core
- Bobbins
- Insulating materials
- Insulating liquid
- Tank

Types of transformers: