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Resonance: Phase Definition
Defining the parallel resonant frequency as the frequency at which the voltage and current are in phase, unity power factor, gives the following expression for the resonant frequency:
The above resonant frequency expression is obtained by taking the impedance expressions for the parallel RLC circuit and setting the expression for Xeq equal to zero to force the phase to zero. After about a page of algebra, the above expression emerges. Note that for small values of the resistances, this approaches the series resonant frequency.
Eli Priyatna 29 Apr, 2011--
Source: http://basistik.blogspot.com/2011/04/make-animated-physics-with-java_4411.html
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