I was reading up on basic properties of plasmas and came across this description in the [Wikipedia](https://en.wikipedia.org/wiki/Plasma_parameters#Electron_temperature) on how to convert between eV and Kelvin units to describe the amount of energy of the electrons:

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> The SI unit of temperature is the kelvin (K), but using the above relation the electron temperature is often expressed in terms of the energy unit electronvolt (eV). Each kelvin (1 K) corresponds to 8.617 333 262...×10−5 eV; this factor is the ratio of the Boltzmann constant to the elementary charge.[5] Each eV is equivalent to 11,605 kelvins, which can be calculated by the relation $⟨ E ⟩ = k\_{\text{B}} T$.
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This last equation has me confused. Why do we *not* write instead

$$⟨ E ⟩ = \frac32 k\_{\text{B}} T$$

after all an electron has three translational degrees of freedom? What am I missing?