noise power

The electromagnetic noise radiated into the air from wiring, represented in terms of power. Since the noise power is caused by the thermal motion of electrons determined by the temperature of the resistor (conductor), it is also called thermal noise. The noise power Pn generated from the resistor (conductor) is expressed by the following formula, 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, the reference is 1PW, and the logarithmic unit decibel (dBPW) is used.