... Archives . ... One of the biggest culprits is the unit of energy, [keV], which is 1000 electron Volts, for the energy acquired by an electron when it falls through an electric potential of 1 Volt: . ... Then, a temperature in degrees Kelvin can be written in units of keV by converting it with the formula . ... It is tempting to put the two together and interpret a temperature as a photon energy. ... For example, a 1 keV (temperature) Bremsstrahlung spectrum extends out to 1 keV (photon energy). ...