Calculating inductance...

Just a couple questions:

Z is AC current? (as in V = IR)
What is a sense resistor?  Just a resistor of a known value?
Z=2piFL, F is Frequency?

I'll try it this weekend, and if I don't get a reply, I'll try it with the 
assumptions above.  However, my volt meter is suspect, so I'll try
to get it to read some roughly known values accurately.