Posso ricaricare IPhone 14 con alimentatore 12W?

I don't understand your language but if you ask if it's fine to charge your iphone 14 with a ac charger of 12watt then yes it's fine

Watt  is like how fast your car can drive, but the speed limit is how fast your car do drive

the iphone draw as much current as it was build to use when charging, the fact that

a charger can provide a lot more just means it's not having its full capacitive

used