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USB Connection

Discussion in 'Hardware' started by UCHEEKYMONKEY, Aug 14, 2006.

  1. UCHEEKYMONKEY
    Honorary Member

    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    Does anyone know how many volts a USB connection holds and how do I measure the voltage?
     
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  2. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    think it may vary cuz some usb devices require external power aswell...
     
  3. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    True how do find the max voltage?

    Also on the back of printers there is a USB connection so why does the printer still need power from the mains plug instaed of getting through the USB?
     
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  4. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    mains power - cuz good chance the power from the pc wont be able to run this and the USB connection, hot swap plus faster transfer speed...
     
  5. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    Aaaah I see now mmmmm8)

    Has Arroryn finsihed her invention or is she planning to take over the world?
     
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  6. Sparky
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    Sparky Zettabyte Poster Moderator

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    I know this has nothing to do with voltage but if you go into device manager, right click on ‘USB root hub’ and then click the power tab you can see the attached devices and how much mA they are using. 8)
     
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  7. Boycie
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    Boycie Senior Beer Tester

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    First of all i wouldn't stick a voltmeter anywhere near the usb lead- you could short it out and blow the mobo. :eek:

    As for the voltage, i would say 5v (probably) or 12v. These are the only two voltages that come out of the PSU.

    Si
     
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  8. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    USB voltage (on the power line) is 5V. It can supply a maximum current of 500mA.

    Some devices don't take that much power, so can be run just on USB power.

    Note that the 500mA figure is the total for a 'hub', so you can have some devices taking current and some not.

    If you have devices that take a total of more than this then you need to use a powered hub to spread the load about.

    Harry.
     
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