A temperature (in degrees Kelvin) assigned to an electrical component such that the noise power delivered by the noisy component to a noiseless matched resistor is given by where: * = Boltzmann’s Constant (1.38 ∙ 10-23 J/K) * = noise temperature (degrees K) * = noise bandwidth (Hz) Engineers often model noisy components as an ideal component and a noisy resistor in series (see Figure 1) The temperature of the source resistor is often assumed to be room temperature. is used when the noise temperature is room temperature. room temperature = = 290 K = 17°C = 62°F (McClaning2002)