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Discussion in 'General Electronics Discussion' started by Chassis, Oct 10, 2015.

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  1. Chassis

    Chassis

    34
    2
    Apr 21, 2015
    I think I'm confuse,or the textbook I'm reading is confusing me.

    Jus out this question.
    The frequency for periodic time of 40us is ......kHz.
    F = 1 / 40us

    How do you write 40us

    a. 0.0000040
    b. 0.000040
    c. 0.00040

    Which one is the proper one.
     
  2. AnalogKid

    AnalogKid

    2,337
    654
    Jun 10, 2015
    b.

    ak
     
  3. Chassis

    Chassis

    34
    2
    Apr 21, 2015
    Thank you analog.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,305
    2,738
    Jan 21, 2010
    The possibly easy way is to think of 40us as 40 x 10^-6 s

    so it's

    40 x 10^-6 s
    4 * 10^-5 s
    0.4 * 10^-4 s
    0.04 * 10^-3 s
    0.004 * 10^-2 s
    0.0004 * 10^-1 s
    0.00004 * 10^0 s

    and because 10^0 = 1

    it must be

    0.00004 s
     
    Martaine2005 likes this.
  5. Martaine2005

    Martaine2005

    2,575
    696
    May 12, 2015
    Thanks Steve.
    That was really helpful for me too.
    I copied and printed for my personal help file:)

    Martin
     
  6. duke37

    duke37

    5,301
    740
    Jan 9, 2011
    It could help if you spaced the numbers in groups of three so

    40μs = 0.000 040
    40ms = 0.040
     
    Martaine2005 likes this.
  7. Rowdy

    Rowdy

    16
    1
    Oct 9, 2015
    I think ya'll got that one covered duke 37, Steve - factual explanation, Analog - right on.
     
  8. Chassis

    Chassis

    34
    2
    Apr 21, 2015
    Thank you all.:)
     
  9. Chassis

    Chassis

    34
    2
    Apr 21, 2015
    In other words,in my question above

    A. Is 4us
    B. Is 40us
    C. Is 400us

    Is that right?
     
  10. Chassis

    Chassis

    34
    2
    Apr 21, 2015
    Duke37 briliant technique.
     
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