Calculate L in RL AC simple circuit

Discussion in 'General Electronics Chat' started by german, May 12, 2010.

  1. german

    Thread Starter New Member

    May 12, 2010
    Hi everyone,

    I need to make what I am sure is a very simple calculation, but I have never dealt with AC and RL circuits before. The situation is the following:

    The aim was to determine L experimentally.

    A voltage Vin = 4 [V] was applied at a range of frequencies (from 0.1 [kHz] to 3 [MHz]), and the respective Van for an antenna was measured as a function of the frequency (f).

    R = 100 [Ohm]
    Ran = 1.1 [Ohm] (the measured resistance of the antenna)

    With this, and the table f vs Van, how can I determine the inductance L of the antenna?

    I would appreciate it very much.

    Kind regards
  2. dsp_redux

    Active Member

    Apr 11, 2009
    How much do you know about freq. response? Does this means anything to you?
    <br />
H(s)= \frac{V_a}{V_{in}} = \frac{R+ R_a +Ls}{R_a Ls} \text{ where } s=j\omega = j2\pi f<br />