Hey guys, I'm wondering about the mean function of magnetic core? What does it do at any device? Sorry, if my question is stupid!

Thx

 

The key difference between an air coil and a coil around a magnetic core has to do with the permeability of the material. An explanation of this is contained in the following wiki:

https://en.wikipedia.org/wiki/Permeability_(electromagnetism)

Some people recoil at the mathematics required to understand basic physics. If you are in this category, maybe we can provide a more hueristic explanation.

 

Provide a low "resistance" path for magnetic "current" (flux Φ).

 

The magnetic flux impedance is much lower in the magnetic material than air, so it greatly increases the efficiency of magnetic inductors and transformers.

 

This looks like a step down transformer made of EE cores. Any magnetic core performance would directly depend on its permeability.
However you can take this piece of information for further reference: https://nicoreindia.com/magnetic-core-and-where-is-it-used/

 

This looks like a step down transformer made of EE cores.

The TS hasn't been seen since 2016 so you appear to be a little late to the party.