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unknown formula

Discussion in 'Electronics Homework Help' started by foTONICS, Oct 20, 2011.

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  1. foTONICS

    foTONICS

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    Sep 30, 2011
    Hey everyone. I have a mid-term next week and I was going through my notes and I came across this formula:

    k= M/√(L_1*L_2 )

    I believe it has something to do with transformer coupling. L1 and L2 being the first and second transformer. I know that K is a constant, but i am having trouble remembering what the M stands for.

    any help is appreciated.
     
  2. davelectronic

    davelectronic

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    Dec 13, 2010
    My maths is not good, could it be mutual, or mass. Other than that not sure.
    Dave. :)
     
  3. foTONICS

    foTONICS

    332
    9
    Sep 30, 2011
    I found it, M is the mutual inductance between the two transformers
     
  4. duke37

    duke37

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    769
    Jan 9, 2011
    Except that there are not two transformers, only one. There are two windings.
     
  5. foTONICS

    foTONICS

    332
    9
    Sep 30, 2011
    sorry, meant the coils of the two tuned circuits
     
  6. KJ6EAD

    KJ6EAD

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    159
    Aug 13, 2011
    It's a version of the mutual inductance formula arranged to solve for the coupling coefficient. M is the mutual inductance; k is the coupling coefficient (0-1).
     
    Last edited: Oct 21, 2011
  7. Will D

    Will D

    15
    0
    Mar 14, 2012
    You are right fo Tonics M is Mutual induction in the formula.
     
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