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How do you calculate how many Watts a device uses?

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  • How do you calculate how many Watts a device uses?

    I am trying to figure out how many watts the hardware I am using needs (approximately). How do I calc that?

    My Equip:
    ITX EPIA 800 (pre-M series)
    Laptop Harddrive(5V)
    Laptop DVD-ROM (5V)
    LCD (Found it uses approximately 5 watts using 12V)
    Touchscreen (12V)
    (2) USB Devices

    All I need is the method to calc it, but if you know offhand what these pieces typically use, I would greatly take that info as well.
    New site at
    http://customcarpc.dreamhost.com

    http://home.attbi.com/~rbarr110

    2002 Toyota Tacoma Doublecab

  • #2
    Amps x Volts = Watts

    2A x 12v=24W

    5w/12v=.5A
    current projects

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