Forum Discussion
bob_nestor
Sep 25, 2017Explorer III
wa8yxm wrote:
As I recall the "Standard" for USB ports is 500mA or 1/2 amp
My phone can suck 2 or more amps off a well designed charger/adapter via the USB cord..
NOW. a WELL DESIGNED USB port WILL limit the current... but the key word is WELL DESIGNED.. Not ever designer even knows HOW to limit current (i do but hey. I paid attention in DC Theory)
For USB 1.x and 2.0 the power is 0.5A; for USB 3.0 it is 0.9A.
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