Basic usage of N Channel MOSfet. When the Gate is connected to Ground then MOSfet stops current flowing. When Gate is connected to Positive then MOSfet lets current flow and the Led lights up.
IRFZ44N and IRLZ44N are very common MOSfets to use with arduino-like systems because the Gate voltages are suitable with 5V logic degree of arduino power and signal voltages. Especially IRLZ is more suitable because of its a Logic MOSfet and so the threshold voltage of Gate gives more accuracy on contolling current. Same result can be taken by using PWM with the IRFZ serie. Chosing the way is up to you ; A pot with L Serie or to use PWM with F Serie. To use MOSfet as a dimmer.
