# Homework Help: Finding inductance

1. Feb 21, 2010

### mathman44

1. The problem statement, all variables and given/known data

Find the inductance L. This is for a lab experiment. For a resistor-inductor series circuit, I have a graph of a triangular input waveform from a generator and the voltage across the inductance, VL, as a function of time. I also have the value of the resistance R.

3. The attempt at a solution

Well, given this information, I need to find the value of L. I've looked over the equations which seem most relevant but I can't find a suitable one. What am I overlooking?

2. Feb 21, 2010

### Mindscrape

Without knowing how your graph looks or any other specifics of your problem, it's a bit hard for me to help, I don't know about anyone else. Here's what I can tell you:

You know that

$$V = L \frac{dI}{dt} = L \frac{\Delta I}{\Delta t}$$

which will give you the voltage drop across the inductor.

3. Feb 21, 2010

### mmmboh

Yeah that's what we did, we rearranged the equation to be L=RV(dt/dv)