# Can someone help! How do you calculate the Q factor!?

Discussion in 'Homework Help' started by cfinley, Jul 21, 2012.

1. ### cfinley Thread Starter New Member

Jul 21, 2012
5
0
Hi all,

Hoping someone can help...

How do I calculate the Q factor with the following information:

Coil has a resistance of 100kΩ at a frequency of 2kHz.

R=3mH
X= 2.7MΩ

Is that enough info or am I missing some data in order to find the Q factor?

2. ### WBahn Moderator

Mar 31, 2012
18,093
4,918
Perhaps the problem makes things a bit clearer than you've presented them, but this seems highly disjointed.

What does it mean for R to be 3mH? R is normally reserved to real resistance.

What does it mean that the "resistance" of the coil is 100kΩ at 2kHz? Is that only referring to the effective real resistance, or is it the reactance, or is it the impedance? Those three terms mean very different things.

When X is given at 2.7MΩ, is that the reactance of the total circuit? Are we talking about a series LC or a parallel RC? Is that at 2kHz, as well?

Is 2kHz the resonant frequency?