Hi! This isn't strictly related to an Arduino, so feel free to remove, but I've lurked on this forum for awhile (for my other Arduino-centered projects) and I wasn't sure where else I could ask this question online.
I’m currently trying to power a DC fan through a USB connection (splicing the fan into the power wires of the USB) and I have a very basic question. My fan is max 5V and 65mA, but a USB 2.0 cord (which I’m using) is 5V and 500 mA. So the voltage is fine, but do I need to step down the current before I hook my fan up? If I do need to step down my current, does anyone know an easy way to do that?
I was looking at adding in another resistor in parallel to pull most of the current, but then I’m running into the problem of power ratings on resistors—I think I would need a 560 ohm resistor with a power rating of 107 W, which isn’t really realistic. And then I started playing with adding in more resistors in series and parallel to limit the power needed through one resistor and that was a whole other variable problem.
Thanks in advance!!