Help understanding 12v 0.09amp Fans etc.

[Gee]

I don't know why my brain has a problem with the relation of volts amps etc. If anyone could link me to a good place that might help me understand it better or help me relate it to RC applications. I would appreciate it. The current reason I am asking is htat I have some fans that I would like to put on my RC to help keep the ESC motors cooler. The ones I have laying in from of me are most likely from computers. They are all 12v with the amp rating as 0.19, 0.58, 0.16, and 0.09. I would guess the higher the amp the more it will draw from the batteries. Are any of these compatable for use with RC applications running 7.2v RC's. Will they require too much from the battery to be of any use? If it indicates 12v can it be connected through the receiver. I've tested them directly on a 7.2v battery and they work. This post seem a bit scattered. Hope somebody understands what I'm not sure I am asking.