so as i was straightening up this morning, a thought popped into my head. i have an external usb 2.0 7 port hub. that is plugged into the back of my computer, since they are nice to have, but hard to get to just to plug something in for a short time. anyway, because of the large number of ports, and the potential of drawing more power than is available thru the normal plug, it comes with a power supply that also plugs into the hub. so i have 4 questions about this. 1) i theorize that the power from the external supply would be pushed into the computers usb circuit whenever there is power that is not being used by whatever is plugged into the hub. am i correct in this theory? 2) and will any excess power hurt anything inside of my computer? 3) what about when the computer is in sleep mode, or turned off? 4) also, would this power be pushed into the usb 3.0 circuit as well? my thinking on that is that in most likelihood, the power for both systems comes from the same part of the power supply, and would most likely back feed into it. i am not even going to get into the possibility of the motherboard sharing a power source thru the circuits laid out on it. that would be for me to follow the board circuits in a diagram, but i think that would be an exercise in futility if the power going to both systems is shared at the power supply anyway.
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