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Find current from voltage drop?

Discussion in 'Electronic Basics' started by js5895, Mar 23, 2005.

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  1. js5895

    js5895 Guest


    The voltage drop formula:

    K x I x L x 2
    E = ----------------

    I know all the values, except "I", so is there a formula to find "I".

  2. Gareth

    Gareth Guest

    Are you saying that you know all the values in your equation except I,
    and you want to find I? If so that is simple algebra.

    Multiply both sides of the equation by CMA:-

    E x CMA = K x I x L x 2

    Then divide both sides by K x L x 2:-

    E x CMA
    ---------- = I
    K x L x 2

  3. Kitchen Man

    Kitchen Man Guest

    See Gareth's answer, unless you don't know either E or I, in which case
    you cannot find the answer from the known information.

    I have a question. What are K, C, M and A? I'm assuming this is a
    formula for the drop across an inductor, where E = I * XL, and XL =
    2*Pi*f*L, so somehow Pi*f = K/(CMA)? Thanks.
  4. John  Larkin

    John Larkin Guest

    Probably wire loss E in volts.

    L = length
    I = current
    CMA = wire cross-sectional area, circular mils
    K = fudge factor
    2 = round trip

  5. js5895

    js5895 Guest

    Thank You very much.
    If thats simple algebra, I don't know algebra, lol.

    K = Approximate/Exact K of wire
    I = Current
    L = Length of wire, one way
    2 = There and back
    E = Voltage drop
    CMA = Circular Mill Area of wire
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