Confused with questioin (minimum value for total impedance)

Discussion in 'Homework Help' started by metelskiy, Jan 26, 2011.

  1. metelskiy

    Thread Starter Member

    Oct 22, 2010
    In an ac series R, L, C circuit, in which R=2K, L=10mH and C = 1uF, the frequency of the source varies between 100 Hz and 15 kH.
    The minimum value for the total impedance in the circuit will be:
    a. ...0

    b. ...1k

    c. ...2k

    d. ...3k

    e. ...4k

    I don't really understand what asked
    What I did is i found total impedance @ 100Hz=2165Ω and total impedance @ 15kHz=2630Ω
    Can someone light me up what do I need to find? Thanks.
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Presumably the series RLC circuit will achieve series resonance at some frequency within the limits 100-15kHz. At that resonance point the circuit will be purely resistive and the answer is then hopefully fairly obvious.

    Check the resonance condition for given L & C first.
    metelskiy likes this.