inductance from graph

Discussion in 'General Electronics Chat' started by blpanther, Feb 2, 2016.

  1. blpanther

    Thread Starter New Member

    Nov 23, 2015
    5
    0
    Hi, Need help with some questions:
    I need to determine the inductance from the gradient of graph (graph is showing frequency changing from 500-2500Hz vs inductor voltage) circuit current is kept same by increasing signal generator voltage... The gradient of the graph is vertical length divided by horizontal length but if I use that it doesn't even come close to the value of inductance (which is 100mH).
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,766
    1,099
    We're not psychic ;).
    If frequency is along one graph axis, what is along the other axis?
    Apart from an inductor, what else is in your circuit? A schematic of your circuit would help.
     
  3. blpanther

    Thread Starter New Member

    Nov 23, 2015
    5
    0
    on the other axis we have inductor voltage. in the circuit there is only a resistor and this inductor (in series) plus a signal generator.
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,414
    3,353
    Units, units, units!

    Reactance = \omega L

    Reactance in ohm.

    \omega  = 2\pi f in radian/s

    L in Henry.

    L = \frac{Reactance}{2\pi f}

    The denominator f is in Hz multiplied by 2\pi.

    The numerator is in ohm.
     
    Last edited: Feb 3, 2016
  5. blpanther

    Thread Starter New Member

    Nov 23, 2015
    5
    0
    so on the graph I have following points
    (0,0) and for example (2500,950) - frequency and voltage respectively.
    If I divide 950/2500 I get 0.38 as graph gradient. How does that relate to inductance (which is 100uH) ?
     
  6. Bordodynov

    Active Member

    May 20, 2015
    637
    188
    See:

    CalcL.png
     
  7. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,766
    1,099
    Is this 'homework help'? If so, show us your calculations so far.
     
Loading...