2018-05-24 8:41 GMT+01:00 H. Schmalzbauer - OmniLAN < h.schmalzba...@omnilan.de>:
> Am 23.05.2018 um 22:35 schrieb Ravi Pokala: > >> Hi Traz, >> >> You're referring to power consumption in terms of (milli)Amps. That's not >> right; power is measured in Watts. What you're actually talking about is >> *current*. And it looks like in some situations USB devices can draw more >> than 500mA. >> > > Since the voltage isn't a variable when talking about USB power, speaking > of "power" while refering to current seems valid to me – it's 5 V only and > those who read that don't even need to do any math in head. > I never read 2500mW in USB world, 500mA is common. > Just my 2¢ > I've just did some googling, and it seems you're right - while from physics point of view mA is definitely current and not power, pretty much everywhere I look the USB power (reported in bMaxPower) is specified in mA, not mW. Thus, I'm leaning toward leaving it as it is - wrong from a physics point of view, but aligned with the the USB naming convention. _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
