Noise power

The electromagnetic waves emitted into the air from wiring as radiated noise converted into electric power. Noise power is caused by the thermal motion of electrons determined by the temperature of a resistor (conductor), and is therefore also called thermal noise. The noise power Pn generated from a resistor (conductor) is expressed by the following equation, where the Boltzmann constant is k (J/K), the absolute temperature is T (K), and the frequency bandwidth is B (Hz).

Pn = kTB (W)

When expressing noise power, decibels (dBPW), which are logarithmic values referenced to 1 PW, are used.