On 9/4/06 at 9:51 AM Mike Sawyer wrote:
>Peter said:
> "Because the 'XL' is really sq.rt (XL^2 + RL^2) and the 'XC' is really
>sq..rt (XC^2+ RC^2) where RL and RC are the series resistances of the
>inductor and capacitor respectively. If you take the case where Q=5, then
>the 'XL' becomes an impedance of 1.1XL with a phase angle of 78.7degrees,
>rather than 90"
>
>
> Whoa Nellie! The way reactances are taught here are: XL) XL=2*p*f*L
>where as p= 3.14 (for all practical purposes), f= frequency, and L=
>inductance in henries. Then XL is the reactive component in ohms. XC=
>1/2*p*f*C, where C= capacitance in farads. Like wise, XC is the reactive
>component.
Those are the same formulae used to determine the Pi tank circuit. One also has
to remember that though Rload is static, Ranode is dynamic.
> Never in the course of any electronics training and basic AC theory
>(at least here anyway) has the circuit resistive component been used in
>computing capacitive or inductive reactance. It IS used in determining the
>overall "circuit Q", but it is done completely and independently of the
>reactance computations.
>Mod-U-Lator,
>Mike(y)
>W3SLK
>
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Best,
Will
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