Mosfet or as we all know, switch; it is an electrically operated switch that allows a current flow, it is made of silicon.
These devices can act as a switch without moving parts, and their main function is amplification.
Doping is used to improve the conductivity of semiconductors.
HERE ARE SOME PICTURES THAT EXPLAIN A LITTLE BIT:
![Transistor 2N2222 como interruptor Arduino UNO- HeTPro](https://www.hetpro-store.com/TUTORIALES/wp-content/uploads/2015/03/2n2222.png)
![Anyone who still wondering what are the DC motor controller, we ...](https://i.pinimg.com/originals/d4/2f/e7/d42fe746fc7106a79c0465677d0c3fbf.jpg)
This are two links of two videos that explains better the functions of a TRANSISTOR:
https://www.youtube.com/watch?v=7ukDKVHnac4
https://www.youtube.com/watch?v=stM8dgcY1CA
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