Bromio
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Hi.
When using spectrum analyzer to measure the response of a coil (a RLC circuit), I see that there is a peak at one frequency (resonance frequency). This is logical because we can model a coil as a RLC circuit. If I change the frequency of the sinusoidal source, the peak reduces its value.
My question is: why is there a higher peak at resonance frequency? If what I measure is the power dissipated (by the resistor, of course), why is there a dependence with frequency?
If complex power is written as P = P_{loss}+2j\omega\left(W_m-W_e\right), where P_{loss} = \frac{1}{2}\left|I\right|^2R is the dissipated power, W_e is the electric energy stored in the capacitor and W_m is the magnetic energy stored in the inductor, why the analyzer doesn't show a constant peak value (given by P_{loss}) whatever the frequency of the sinusoidal source?
Thank you.
When using spectrum analyzer to measure the response of a coil (a RLC circuit), I see that there is a peak at one frequency (resonance frequency). This is logical because we can model a coil as a RLC circuit. If I change the frequency of the sinusoidal source, the peak reduces its value.
My question is: why is there a higher peak at resonance frequency? If what I measure is the power dissipated (by the resistor, of course), why is there a dependence with frequency?
If complex power is written as P = P_{loss}+2j\omega\left(W_m-W_e\right), where P_{loss} = \frac{1}{2}\left|I\right|^2R is the dissipated power, W_e is the electric energy stored in the capacitor and W_m is the magnetic energy stored in the inductor, why the analyzer doesn't show a constant peak value (given by P_{loss}) whatever the frequency of the sinusoidal source?
Thank you.