Static electricity

Discussion in 'MacBook Pro' started by lazypoet, Jul 17, 2017.

  1. lazypoet macrumors regular

    lazypoet

    Joined:
    Jun 9, 2015
    #1
    So I got my new 2017 macbook pro 15 inch macbook pro in the mail today (YAY), but I've noticed static electricity on the surface of the macbook pro when I rest my hands on it. Is this normal?

    The Macbook Pro didn't come with an extension cable, which surprised me. I've heard the extension cable grounds better the electricity. So can I/should I use my 2010 macbook pro extension cable on my new charger?
     
  2. jerryk macrumors 68030

    Joined:
    Nov 3, 2011
    Location:
    SF Bay Area
    #2
    Do you feel this when it is not plugged in?

    MacBooks, and other computers, will bleed current (tingling sensation when touching them) when they are charging. But when you unplug the charger it stops.

    If that is what you are feeling it is normal.
     
  3. lazypoet thread starter macrumors regular

    lazypoet

    Joined:
    Jun 9, 2015
    #3
    It's when it's plugged in (without extensions cord).

    My 2010 Macbook Pro never has this (plugged into the same outlet). So I'm thinking it has something to do with the lack of an extension chord on the new model.
    --- Post Merged, Jul 17, 2017 ---
    I took the risk and plugged it in with my old extension chord and now the static electricity is gone. I recommend this to anyone experiencing this :)
     
  4. jerryk macrumors 68030

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    SF Bay Area
    #4
    Usually a grounded plug will get rid of that effect. It is harmless, but a bit annoying.
     
  5. Populus macrumors 6502

    Populus

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    Aug 24, 2012
    Location:
    Valencia, Spain.
    #5
    I've always used my 2010 MacBook Pro plugged with the regular cable, without the extension cord. Thus, I've always felt that electric deeling when touching the aluminum. A bit annoying, but it has been this way since Jobs times.

    My 2010 MBP does that. My 2015 MBP does it too. The new 2016 MBP has that feeling too.
    A bit annoying, yes, but is completely normal :)
     
  6. lazypoet thread starter macrumors regular

    lazypoet

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    Jun 9, 2015
    #6
    So there is absolutely no harm being done to the mac with the constant static charge? I thought static electricity was bad for hardware.
     
  7. Stefan johansson macrumors 65816

    Stefan johansson

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    Location:
    Sweden
    #7
    Static charges need to be rather powerful to damage a laptop,as the internal components is protected,and the light power leak that gives the ticklish feeling is actually not static electricity,it's power leak from the internal power relay. As it's only low voltage,it's clearly harmless,and a better cable with ground connection will solve it.
     
  8. MC6800 macrumors 6502

    Joined:
    Jun 29, 2016
    #8
    Technically what you're feeling is an alternating electric current, not static electricity. Static electricity is a stored charge, and would only be transferred on the first touch, often as a small spark (and yes, it's bad for the internal circuitry, but that's protected by the conductive case).

    The current you're feeling is the 120V (or 240V) AC from the wall socket, but greatly limited by internal impedance of the AC adapter and resistance of your skin. It's due to your computer's floating ground. Here's a discussion of the effect.
     
  9. elf69 macrumors 68000

    elf69

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    Jun 2, 2016
    Location:
    Cornwall UK
    #9
    my 2007 macbook pro 17" and 15" both do this But I have an apple power cord so use I use it on these.

    my 2012 macbook air does NOT do this though, possibly due to lower power PSU.
    And my 2010 macbook is plastic so no issue there.

    Another very very good reason not to use 3rd party chargers as the locating pin for tip or cord is usually plastic and not an earth point.
     
  10. Stefan johansson macrumors 65816

    Stefan johansson

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    Sweden
    #10
    Exactly how the charger is made,depends on legal regulations in the area where it's sold. For example,a US charger would definitely not work in the 240V AC networks in most of Europe.
     
  11. elf69 macrumors 68000

    elf69

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    Cornwall UK
    #11
    maybe but all my genuine mac chargers state 100-240v input
     
  12. Stefan johansson macrumors 65816

    Stefan johansson

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    #12
    Oh yes,but the socket part,that's interchangeable,is not the same in all countries.
     
  13. elf69 macrumors 68000

    elf69

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    Location:
    Cornwall UK
    #13
    of course.

    but worse case any 2 pin mains lead will fit the mac chargers.
     
  14. Stefan johansson macrumors 65816

    Stefan johansson

    Joined:
    Apr 13, 2017
    Location:
    Sweden
    #14
    Probably,but here,MacBooks sold at Apple resellers are usually delivered with two power cables with different wall plugs,one grounded and one not. At least mine was like that,due to the facts that many users in rural areas around here use grounded wall sockets as a part of their protection against thunderstorms. I'm not sure if it will protect the computer,but it would hopefully prevent a fire caused by a plugged in heater,coffee machine or floor lamp.
     

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