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I've been trying to derive the expression

w = sqrt( (1/(LC)) - (R_l^2 / L^2) )

where w is the resonace frequency, L is the inductance of the inductor, R_l is the resistance in the inductor, R is the resistance of the resistor and C is the capacitance of the capacitator.

for this circuit:

http://web.telia.com/~u18412273/lcr.JPG [Broken]

I'm not sure how to attack the problem and I can't find any good texts about it.

I know how to do it in series circuits. I've been trying to do it in a correspondning way for this one but I can't quite do it.

Any help is appreciated

/Daniel

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# Resonance frequency in an LCR circuit

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