I work with a computer and I was wondering if using its USB ports to charge the devices that I use the most (mostly my phone and my e-reader) while working as opposed to charging them using a normal wall charger would make any impact.
I am interested in two things. First, would I save any money over the year? (We can assume that I charge my phone daily, my ebook once a week and some other devices once in a while)
Secondly, does this make any environmental impact? Am I actually decreasing the quantity of electricity that I use or just making the computer to use more energy to compensate the charging of the devices?