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Fourier transform of power
In the notes I am reading they use the following. Let $U$ be the voltage (depends on time) and $I$ the current in a circuit with some resistor with resistance $R$. Then the power is given by:
$$P(t)=...
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What is the physical interpretation of the Fourier transform $(\mathcal{F}Z)(t)$ an impedance?
If I compose a impedances out of smaller ones in series and parallel configurations, e.g.
$$Z(\omega)=i\omega L_2+\tfrac{1}{\tfrac{1}{R_1}\ +\ i\omega C_1+\ \tfrac{1}{i\omega L_2}},$$
then I get a ...
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