The noise figure is the difference in decibels (dB) between the noise output of the actual receiver to the noise output of an “ideal” receiver with the same overall gain and bandwidth when the receivers are connected to matched sources at the standard noise temperature "T"0 (usually 290 K). The noise power from a simple load is equal to "kTB", where "k" is Boltzmann's constant, "T" is the absolute temperature of the load (for example a resistor), and "B" is the measurement bandwidth.