I finished a stir plate build, but am having a little trouble getting my head around the current rating needed of the wall wart. My fan is labeled 12VDC and .8A, and I am using a 9VDC 600ma wall wart, with a couple 3W resistors in place to get the speed I want. It's working fine, but now I'm starting to wonder, do I need a higher current rated wall wart? Or in the same way that the fan simply runs slower when I give it less than 12V, will it pull less current?