Re: What is the tempature of a DC 9KV electrical arc?

It is obstructive to calculate the arc temperature directly from some 
simple equation. Usually it is obtained by some numerical profile method
(e.g. Doppler profile) from IR spectra. The temperature strongly depends 
on the arc zone, it can vary from 30 000 K in its center to 3000 in its 
outer zone. Electrically, it does not depend on voltage nor resistance, 
these are important only for acr generation. arc may appear at relatively 
low voltage, and its intensity is reduced by the increace of resistance 
(brings about lower current). So, arc depends on current flowing through 
the arc. Higher current means higher number of electrones which are of 
high energy (therefore high temperature).
Hope I helped, sorry for English (I am not a native).