Researchers in China have used electrochemical impedance spectroscopy to analyze the state of health of sodium-ion batteries. Extracting four features from the measurements, they were able to create a ...

Heading image: Input impedance plotted as a function of trace impedance for trace lengths of 1/10, 1/16, and 1/20 of a wavelength. (Credit: Baltic Labs) ...

“Surge Impedance” is a great term that inherently explains why characteristic-impedance is a constant-value in ohms, rather than, say, some function of frequency (e.g. reactance).

Impedance – is a complex measurement of opposition to current flow in an (AC) circuit. With AC, or alternating current (alternating at any frequency higher than Zero Hertz, which is Direct Current) ...

Impedance is normally fairly flat from 100 to 15,000 Hz, but below 100 Hz it falls very rapidly and becomes a function of energy needed to hold the cone in position rather than to move it.