The cathdde voltage drop, in a mercury arc rectifier, is due to________?
Aexpenditure of energy in overcoming the electrostatic field
Bsurface resistance
Cexpenditure of energy in liberating electrons from the mercury
Dexpenditure of energy in ionization
Correct answer
C. expenditure of energy in liberating electrons from the mercury
Explanation
The correct answer is expenditure of energy in liberating electrons from the mercury.