Solved How much voltage is lost in a USB daisy chain

November 22, 2011 at 19:36:20
Specs: Windows 7
I have a monitor with built in USB ports. If I add a USB hub to the monitor, how much voltage is still available on each of the USB ports of the external hub (assuming it's not powered) and how much is still available on the monitor USB ports (assuming nothing else is plugged in)?

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November 23, 2011 at 02:20:32
✔ Best Answer
USB uses 5 volts. It is always 5 volts. It is never anything else but 5 volts. It were to be anything different than 5 volts, nothing would work.

However, if you mean current that is another thing. Each USB port can supply up to 500 mAps. If the USB port you have is powered then each port will provide 500 mAmps.


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November 23, 2011 at 03:38:59
Unpowered usb hubs are a pain in the butt, as often they do not work, and should be avoided.

Whereas powered ones are a different ballgame.

Good Luck - Keep us posted.

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November 23, 2011 at 21:04:12
Count the one in the monitor as a powered one. Use powered ones when possible, especially when you are using long wires, many devices, or high draw ones like hard drives and even DVD drives.

You have to be a little bit crazy to keep you from going insane.

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