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example of impedence calculation

Discussion in 'Electronics Homework Help' started by bazzel, May 17, 2012.

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  1. bazzel


    Nov 10, 2011
    Hello all. I am having a problem working this kind of problem out.

    If I have a series RL circuit and I know the inductance of the coil in henrys, the resistance of the resistor in ohms. It is an ac circuit but I dont know the frequency

    My question is. Can I work out the reactance without the frequency? And, can i work out the impedance in the circuit with those numbers.

    An example would be appreciated. Thankyou
  2. GreenGiant


    Feb 9, 2012
    you would need the frequency

    You could use the formula to create a curve that is based on frequency, and therefor create a curve of the impedance

    But without the frequency you wont get numbers, only equations
  3. bazzel


    Nov 10, 2011
    cheers. What about in a RC circuit. Would I still need the frequency to work out capacitive reactance?
  4. davenn

    davenn Moderator

    Sep 5, 2009
    yes you do

    go and have a look at the formula, see on the bottom line the f = frequency :)

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