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Thanks!

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- Thread starter Mzzed
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- #1

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Thanks!

- #2

Tom.G

Science Advisor

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Both.the resistance of the inductor and capacitor? Or is it what ever the load resistance is further down the line in the circuit?

Create an equivalent circuit using the DC resistance of each component, load, and source resistance.

Calculate the effective DC resistance of all series and parallel branches combined (Thevenin Equivalent). Use that resistance to calculate the Q.

Note that in this sense, Q is defined only around the resonant frequency.

Cheers,

Tom

- #3

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Therefore, in order to combine this resistance Rp with the series loss resistance of the inductor Ri, the value of Rp (relatively large) must be transferred into an equivalent (small) series loss resistance Rs.

- #4

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Thankyou both, exact answers I needed, really appreciate it!

- #5

tech99

Gold Member

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Apart from simple text book questions, I think you need to use the resistance at the operating frequency, because DC and AC resistance differ due to skin effect and dielectric losses.Both.

Create an equivalent circuit using the DC resistance of each component, load, and source resistance.

Calculate the effective DC resistance of all series and parallel branches combined (Thevenin Equivalent). Use that resistance to calculate the Q.

Note that in this sense, Q is defined only around the resonant frequency.

Cheers,

Tom

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