Edit:
I meant this [one](https://en.m.wikipedia.org/wiki/Transformer)
In: Technology
When you make a coil out of electric wire and run alternating current through it, the changes in the current will produce a magnetic field (also alternating) around that coil, particularly in the center of it. That’s the basic principle of electromagnetism.
If there’s an alternating magnetic flow passing through the center of an electric coil, it will induce an electric current in the coil.
In the most basic transformer, you have two coils with different number of winding turns (the number of times the wire is looped) around a magnetic conductor. When you connect one of the coils to voltage, the magnetic conductor carries the magnetic flux induced in it by the first coil through the second one. Since the coils have a different number of turns, the voltage in the second coil will be different than in the first. This way you can transform super high voltage from the power lines into 220V you use at home.
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