>
>Rich says;
>
>>When XL = XC, a series or a parallel circuit is resonant
>
>It depends on how you define resonance. A parallel tuned circuit can be
>defined
>as resonant when
>
>1. XL = XC, OR
>2. when the voltage across C is maximum OR
>3. when the current through L is maximum OR
>4. when the impedance is maximum OR
>5. when the applied V and I are in phase
>
>They all give different answers when you take finite Q into account. XL =
>XC is
>a convenient approximation for use when Q is relatively high. With a low
>Q, it
>fails.
>
>By using the definition of resonance as V and I in phase (or power factor
>= 1),
>you get identical definitions for both parallel and series circuits, and much
>easier analysis of both low Q and coupled circuits.
>
>Thus a low Q circuit according to Rich's definition will have a different
>resonant frequency to that according to Tom's definition. Personally, I
>prefer the V and I in phase, but provided that you state which definition you
are
>using it doesn't matter.
>
When I design an L-network, XC never =s XL.
>
cheers, Peter
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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