Does my 7 port USB hub need AC Power adapter

October 22, 2010 at 20:48:13
Specs: Windows 7, 4 gb
I have a Dell laptop running Windows 7. I just got a 7 port USB (2.0) hub with an optional AC Power adapter. Although is says"optional" I want to use it with my laptop and plug in a large printer - a smaller printer - a scanner and an ipod docking station - and occasionally plug in my digital camera for transporting photos.

Should I use the power adapter to be safe or not necessary? The AC cord is extremely short so I will have to plug it into an extension and then a power strip.

Thanks in advance for your advice - I just dont want to burn anything up or cause problems with my laptop or peripherals.

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October 22, 2010 at 20:59:22
use the power adaptor otherwise you risk overloading the usb port and burning it out

Goin' Fishin' (Some day)

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October 23, 2010 at 01:13:45
It depends upon your laptop. Newer ones may have a power USB port that can more than the normal 500 ma per port. My Dell has one port capable of supplying 2 amperes. Using such a port may shorten the run time on battery drastically.

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October 23, 2010 at 16:53:53
Nothing burns up. .

USB port will provide up to100 ma or cut power off. If more current is requested by a USB device, port will provide up to 500 ma or cut power off. It is that simple.

If you do not use the power adaptor, then only 500 ma can come from the computer. That is maybe 100 ma for only four ports. And no power for another three.

With the power adaptor, all seven ports might consume as much as 3500 ma via the adaptor. If any port draws too much, the port simply cuts power off.

Where do the words 'burned' or 'damage' appear in any of this? Doesn't. Did not appear when USB was defined 15 years ago. Can't if one learned basic USB concepts.

Now, if you did not know these numbers, then reread them. Nobody grasps the concepts behind those numbers in a first reading.

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