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3,9k and 3k9 resistance - are the same?

Discussion in 'Electronic Basics' started by Pfrogs, Jul 23, 2003.

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  1. Pfrogs

    Pfrogs Guest

    Hi,

    this might seem a stupid question, but I need a 3,9k resistance but I can
    only find at the on-line store a 3k9 resistance. Are they the same? I'm
    asking this cause I also need a 4,7k resistance and the reference, at the
    on-line store, is actually 4,7k.
    If they are the same why do they sometimes use decimal notation and other
    times use the ?k? notation?
    Regards,

    Pfrogs
     
  2. John Larkin

    John Larkin Guest

    What you really want is a 3.9k resistor.

    John
     
  3. I don't have any idea why this place sometimes uses a decimal point
    and sometimes not, but a 3k9 resistor is certainly a 3900 ohm
    resistor. On schematics (that might get photocopied or scanned)
    decimal points can get lost or ignored in the noise, so the k as
    decimal point notation was adopted by many as a more reliable way to
    graphically record a decimal point.
     
  4. Wong

    Wong Guest


    Hi,
    Easy for lazy peoples to speak ?
    4.7K and 4K7 ??
    ^
     
  5. cpemma

    cpemma Guest

    All over Europe. As an aside, I've just used some caps marked 222k.

    Now that must be 2 - 2 - 2 zeroes - 3 zeroes. 2200000. Quite a mouthful for
    a tiny cap.

    It would be far clearer to mark them 2n2.
     


  6. Are you sure the "k" means 3 zeros in this case? If so, wouldn't that make
    it a 2.2uF? My guess is that it's simply a 222 cap (2n2) and the "k" has to
    do with something else (type of dielectric perhaps?).

    Costas
     
  7. The K means 10% tolerance. It is a 2n2 (2200 pf).

    See:
    http://www.twysted-pair.com/capidcds.htm
     
  8. Over a longer period, I'd say that 'four kay seven' was rather more
    commonly heard than 'four point seven kay'. I'm in the yoo kay.

    As well as the often made point about decimal points getting lost on
    copies, there's also the issue with many Yerpeens (not in the UK) using
    a comma as the decimal separator.

    Cheers
     
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