# How to find value of inductance in LR series circuit?

mathman44
Hi. This is a question from my lab. I have a series of measurements of the voltage drop across a resistor for various frequencies with a constant voltage source in an LR series circuit. From these measurements I am supposed to calculate the value of the inductance "L". How can I do this?

Phrak
For homework help you have to show some work to get some help.

What is the reactance, XL as a function of frequency?

mathman44
XL = $$2*pi*f*L$$

Phrak
OK... are you going to solve for L using geometry or the equations for complex impedence?

mathman44
Geometry. Got it, thanks.

Phrak
Good deal.