Finding Inductance and Internal Resistance in a Series LCR Circuit

[physicsroy]

help me please! [Inductance]

Homework Statement

an experiment to determine the inductance and internal resitance of an inductor in a series LCR circuit.
I am proved with an a.c. power supply, an inductor, a capacitor substitution box, a resistor and an a.c. voltmeter

Homework Equations

how can i find the resonace frequency, inductance and the internal resistance of the inductor?

The Attempt at a Solution

I was suggested to use graphical method to find out the resonance frequency
but i don't know how can i do it.

 

[ak1948]

At resonance the sum of the inductive and capacitive impedances = 0.

This occurs at the frequency f = 2pi sqrt(1/LC).