Why Is iMac Consuming Power When It Is Off?

Discussion in 'iMac' started by seasurfer, Dec 21, 2015.

  1. seasurfer macrumors 6502a

    Joined:
    Dec 12, 2007
    #1
    Just wondering why?

    If that is the case, shouldn't everyone pull of the plug of iMac when not in use?
     
  2. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #2
    I don't even turn mine off, so I'm probably less likely to unplug it.

    I would assume first, the transformer is the most likely culprit, that is many devices have a powerbrick, which is the transformer. That uses some electricity even if the product is off. The iMac's transfer is on the inside of the computer but still its converting A/C to D/C. Plus it maybe powering some of the circuity to keep the clock going and also the power switch since that's not a fully mechanical switch AFAIK
     
  3. tyche macrumors 6502

    Joined:
    Jul 30, 2010
    #3
    It's costing you ~ $0.01 a week leaving your iMac plugged in and turned off. If you want to unplug your computer every time it's not on, go for it. I'll pay the 50 cents a year convenience fee.
     
  4. Fishrrman macrumors G3

    Joined:
    Feb 20, 2009
    #4
    I keep my Mac and related peripherals connected to a surge suppressor.

    At night or if I'm away from home, it's all powered down and I flip the on/off switch on the power strip to "off".

    Absolutely NO power being consumed that way!
     
  5. seasurfer thread starter macrumors 6502a

    Joined:
    Dec 12, 2007
    #5
    Ha. But the question is why does the iMac need to consume power when it is off?
     
  6. bent christian Suspended

    bent christian

    Joined:
    Nov 5, 2015
    #6
    Me too.


    No. Anything with a transformer (wall wart, television, media player, etc.) will pull power when turned "off". The easiest way to combat this is to use a surge protector and switch that off when not in use.
     
  7. bent christian Suspended

    bent christian

    Joined:
    Nov 5, 2015
    #8
    In aggregate, this wasted energy is quite a national problem.

    Experts estimate that standby energy drain accounts for anywhere from 5 to 10 percent of an average home's annual power usage.

    http://www.pcworld.com/article/153245/unplug_and_save.html
     
  8. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #9
    that's basically my perspective as well. I'm not going to lose sleep over the little amount it draws, tbough its more then a little for me, since I just leave my computer on all day/night.
     
  9. oneMadRssn macrumors 68040

    oneMadRssn

    Joined:
    Sep 8, 2011
    Location:
    Boston, MA
    #10
    It consumes a tiny bit of power for a few reasons probably:

    - For Wake-On-LAN to work, the network card draws a tiny bit of power.
    - Since the power button is not a physical switch, there is a circuit that needs power to detect when the button is pressed.
    - Likely the NVRAM and other similar chips that require power at all times draw power from the power supply whenever possible, so the backup battery isn't drained too quickly.
     

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