In telecommunication, an **equivalent noise resistance** is a quantitative representation in resistance units of the spectral density of a noise-voltage generator, given by
where is the spectral density, is the Boltzmann constant, is the standard noise temperature (290 K), so .

*Note:* The equivalent noise resistance in terms of the mean-square noise-generator voltage, *e*^{2}, within a frequency increment, Δ *f*, is given by

This article incorporates public domain material from *Federal Standard 1037C*. General Services Administration. Archived from the original on 2022-01-22.