Studying discharging(electric) arc I don't undesrtand some phrases :
" when ionization energy of plasm constituents is higher the arc voltage drop increases"
" arc has much more electron density (current) than glow discharge and so the voltage is smaller"
Remember some physics formulas : V= IR
So if the curreint is higher (like in arc), the voltage also should be higher!! I'm missing something...mhh