Can you charge a Kindle Fire in the wall and not in your computer tower?
You can but remember the outlet in the wall makes electronics hotter than charging via USB and that can burn out a battery, hard drive or logic board quickly. So, do try and alternate to save your battery.
Yes, but you'll need to purchase a USB electrical plug if you don't already have one.
Mines doing that right now
Yes, if you have an android phone then just use that charger. that way you can charge it from your computer, wall, or the car! thats what i do. :)