Question

Could the alternating current resistance of a device depends on the frequecy?

Answer 1

Answer on Question #73361, Physics / Optics

Question. Could the alternating current resistance of a device depends on the frequency?

Answer. In general, if the device contains inductance and capacitance the alternating current resistance of a device depends on the frequency as

$$Z = \sqrt {R ^ {2} + \left(\omega L - \frac {1}{\omega C}\right) ^ {2}},$$

where $Z$ is the resistance of a device (impedance); $R$ – is the resistance; $L$ – is the inductance of a device; $C$ – is the capacitance of a device and $\omega = 2\pi \nu$ – is the angular frequency ($\nu$ is the signal frequency).

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