# inductance from graph

Thread Starter

#### blpanther

Joined Nov 23, 2015
5
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).

#### Alec_t

Joined Sep 17, 2013
12,085
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.

Thread Starter

#### blpanther

Joined Nov 23, 2015
5
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.

#### MrChips

Joined Oct 2, 2009
23,542
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:
Thread Starter

#### blpanther

Joined Nov 23, 2015
5
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) ?

#### Bordodynov

Joined May 20, 2015
2,871

#### Alec_t

Joined Sep 17, 2013
12,085
Is this 'homework help'? If so, show us your calculations so far.

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