hi,every guys,i am currently having difficulty with a RLC resonant circuit.

First of all,what's the relationship between VR and VC?
In addition, i am confused by some terms in resonant circuit.
what're the meaning of following terms:
1-fs
2-fp
3-Qs
4-Ql
5-Qp

 

You might get better help if you post the circuits. You do know that LC resonance occurs when Xc = Xl?

 

UPDATE the circuit as follow,

I know that resonance occurs when XL=XC.

 

That's a series circuit. No frequency is given from the source, so you need to find the F that makes Xc = Xl. R is there for a reason.

 

Assume that's a resonant circuit, so Xc=Xl=30 ohm ,it that right?
Then how about my questions posted at #1 ?

 

Assume that's a resonant circuit, so Xc=Xl=30 ohm ,it that right?
Then how about my questions posted at #1 ?

No frequency is given from the source, so you need to find the F that makes Xc = Xl.

He had asked you about the frequency.

Starting with Xc=Xl, can you obtain \(f_{o}\)?

 

frequency is 5k Hz

 

frequency is 5k Hz

Can you show us how you obtained a value of 5KHz?

 

I am sorry about that i haven't express the question clearly,the question haven't gave any frequency,the source is 50mV only.

Here is the original question:
The question is "Refer to the resonant circuit in figure 1 (posted at #3) ,determine:
(a)the value of Xc --->is the answer 30ohm?
(b)total impedance
(c)current
(d)Vr,Vl and Vc at resonance
(e)The relationship between Vr and Vc

I have figured out (a),(b),(c),(d) but i am stuck at (e)

 

The OP's original question asked what was the relationship between VR & VC in the series circuit - at resonance.

There's no need to find the resonant frequency.

At resonance VR & VC are orthogonal and for the given circuit have a magnitude ratio |VR/VC|=1/3. VR will be 50mV and in phase with the source E.

One could guess the context of the other matters - presumably they relate to resonant frequencies and Q factor values in series and parallel resonant circuits. I don't think anyone is really interested in explaining these terms when they are well defined in any number of text books or web pages.

Such as ....

http://www.allaboutcircuits.com/vol_2/chpt_6/6.html

 

Thanks all guys,now i know how to sort it out.