components values

Discussion in 'Homework Help' started by ecjohnny, Feb 20, 2009.

  1. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    142
    0
    Hi.. can someone answer me this question?

    I have a question in my paper which ask me to calculate some resistor values for some circuit design. After calculating, u get some random answer and it ask you for easily available component( store component value). For e.g. "1.09k ohm" will be "1K ohm" etc...

    How can i or is there a way to know/memorize what values of the resistors value are commercially and easily available?

    I hope someone understand me and give me an answer soon. Thanks a lot!
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    142
    0
    wow.. how do i memorise all of them?
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    The E12 is the most used series.
    10 12 15 18 22 27 33 39 47 56 68 82
    And this times .1 1 10 100 ....
    The next value ia each time about 1.2 times higher.

    The higher series E24 E48 E96 and E192 are for more exact schematics that do not except any tolerance.

    Greetings,
    Bertus
     
  5. veritas

    Active Member

    Feb 7, 2008
    167
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    One of the main things I liked about my schooling in EE/CmpE was the fact that you rarely have to memorize trivial data, like common resistor values. Stuff like that is always in readily available documentation, and if you use something frequently enough, you'll memorize it w/o any effort.

    Why do you need to memorize these?
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    I also keep a copy of the list of standard values as part of the PaintCAD package, which you can download in my AAC blog.
     
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