This is because constant current arcs are extremely power inefficient.
Carbon electrodes put out copious UV and heat which readily ionizes gasses....
The CC method is inefficient since its speced with a CC source using opamps driving mosfets.
there is an intrinsic process of electrons falling in energy levels - giving of all types off light, before being re-energised by the electricity...
Does this mean a carbon arc can be wider with a 5v 200w supply instead of the 200v 1amp?
You are right, this is the process that keeps the plasma alive. The ionised gas is also being heated by the current and that is what makes the plasma hot.
The carbon arc works at one atmosphere when the mean free path is small and the number of ionized molecules is small (as a fraction of the total).
the above statement tends to contradict the other statement you have made:
Do carbon arcs make the type of UV which makes ozone?
Is the nitric acid byproduct a major contributor to electrode wear?
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