Can you give 12.3 Volts on Vin pin of Uno?

Thanks for the reply man.
So this wouldn't be feasible as i have to power other components using the 5 volt pin as well. Any recommendations that you could give?
Also would it be possible to simply hook up a couple of resistors in series to lower the voltage a little? If yes which resistors should i use? And it would be great if you could explain if the current being drawn in any circuit has an effect on the resistors? I am a newbie and this resistor thing really confuses me.

Ps. I know these are alot of questions, but i really need some guidance so your help would be greatly appreciated
Thanks!