Tank Circuit Equation

Discussion in 'Math' started by The Lightning Stalker, Jul 24, 2008.

  1. The Lightning Stalker

    Thread Starter New Member

    Jul 24, 2008
    2
    0
    Hello. I'm trying to isolate L to find out the needed inductance based on resonance frequency and capacitance. I can't remember how to get rid of the square root when it's on the bottom of a fraction.

    Any help please?
    Robert
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    You square both sides.
     
  3. The Lightning Stalker

    Thread Starter New Member

    Jul 24, 2008
    2
    0
    Okay, but what parts do I square, I'm not sure. Also I have no idea how to get rid of the 1 on top of the fraction. It's been a long time since I had to do an equation like this.

    Thank you,
    Robert
     
  4. Mark44

    Well-Known Member

    Nov 26, 2007
    626
    1
    I'm assuming you are trying to solve an equation. As Bill said, you can square both sides of the equation, which will get rid of the radical in the denominator. We can't give you any more advice, since we don't know what the equation you're working with is. If you post it, we can give you some more help.
     
  5. PinkDalek

    Member

    Dec 18, 2005
    10
    0
    Hi Robert, I've hand drawn the formulas for you, I believe this is probably what you want, but please take care when you use them as it's very easy to make a mistake, I would suggest you do a practice calculation using values for L & C and find the frequency and then apply the frequency value to the other formulas with either known value of L or C and when you get the values correct you will know you've used the correct method of working out.

    All the best,
    Lorraine
     
    Last edited: Jul 25, 2008
  6. PinkDalek

    Member

    Dec 18, 2005
    10
    0
    With regard to my previous post it has occured to me that non members or guests cannot view attached images, so here's a simple text version of the formulas for our guests.

    F=1/(2*PI*sqrt(L*C))

    L=1/(4*PI*PI*F*F*C)

    C=1/(4*PI*PI*F*F*L)

    Where F=frequency in Hertz, L=inductance in Henries, C=capacitance in Farads and PI=\pi which is 3.1415927 correct to 7 decimal places.

    I hope that helps.

    best wishes,
    Lorraine
     
    Last edited: Jul 27, 2008
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