10w USB Port

Discussion in 'iMac' started by EggyEggs, Sep 24, 2010.

  1. EggyEggs macrumors newbie

    Joined:
    Sep 24, 2010
    #1
    Hi, I was wondering which USB port on the July 2010 iMac's is 10w? If any are at all that is.

    Thanks.
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    They are all 0.5 watts I think. I do know that no USB port on a computer is 10 watts.
     
  3. EggyEggs thread starter macrumors newbie

    Joined:
    Sep 24, 2010
    #3
    Really? I thought I read somewhere that there was one at least due to the iPad requiring 10 watts to charge? Anyways thanks for your response!
     
  4. NoSmokingBandit macrumors 68000

    NoSmokingBandit

    Joined:
    Apr 13, 2008
    #4
    According to wiki, USB spec carries 500-900ma at 5v, so that would be 2.5-4.5w on a single usb port. Unless i'm wrong, which is likely.
     
  5. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #5
    The iPad requires 10 watts to charge at the full charge speed. It can charge at 5 watts (which is the average USB port I just remembered), but at a slower rate.
     
  6. tbartoncv macrumors newbie

    Joined:
    Sep 10, 2010
    #6
    You are thinking of the power AC power adapter that plugs into a wall. It provides 10w. Most Apple USB ports provide 5V, 500mA. Some newer Macs can provide up to 1100 mA at 5V.
    V*A=W.
    5V*500mA=2.5w.
    5V*1100mA=5.5W
    10W/5V=2200mA
     

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