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Thread: what is the maximum current output of a USB 2.0 port?

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    Default what is the maximum current output of a USB 2.0 port?

    what is the maximum current output of a USB 2.0 port?
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    Please take note of the word current and not voltage I can't help you here just trying to help prevent the (+5v) posts. and for my 1 post


    Quote Originally Posted by RandomYahooPerson
    Of course Amps are current, power is measured in Watts.

    Most USB ports are 500mA @ 5V, or 2.5 W
    http://uk.answers.yahoo.com/question...2020443AAMQxIi

    You can go read up those replies
    Last edited by RickyRudy; Sep 26, 2009 at 11:01 PM.

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    +5v....................... yes i am special

    Its probably 500mA still... wikipedia... gives you 2.5W...
    Last edited by semitop; Sep 26, 2009 at 11:03 PM.
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    its 5v used my digital tester n checked was doing sum mods

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    do u think its possible to series 2 usb port so that u can achieve 10VDC max as each port delivers 5VDC? and would u still get a max. of 500ma in current? Reason why i am asking this is because i have a amplified speaker that requires 9VDC @ 400ma and it have to plug in the wall socket to operate. The speakers play very good. And i need them to take with my laptop on the go without have to be near a wall socket to plug in the speakers. I was wondering if i could power it from the laptop usb ports instead. getting the 10VDC by adding two ports output power then using a resistor to cut down the volts from 10VDC to 9VDC and also the current down to 400ma as i have done some research on the net and they say the usb 2.0 port delivers a max. of 500ma. So is this possible anyone?
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    A lot of trouble to go through when you can just get a decent set of headphones. Ppl who use speakers with laptops usually disturbing someone else anyway.

    I was trying to find a mobile battery pack that charged with USB and allowed you to connect speaker plugs to it but cudnt. It cud be possible to splice 2 usb cables and do what you said.
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    Quote Originally Posted by semitop View Post
    A lot of trouble to go through when you can just get a decent set of headphones. Ppl who use speakers with laptops usually disturbing someone else anyway.

    I was trying to find a mobile battery pack that charged with USB and allowed you to connect speaker plugs to it but cudnt. It cud be possible to splice 2 usb cables and do what you said.
    Agreed.. Headphones would be much better but then again if you're entertaining a crowd..

    I have no idea if you can do that.. Goodluck though.

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