The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
Correct answer: D. expenditure of energy in liberating electrons from the mercury
- A. expenditure of energy in ionization
- B. surface resistance
- C. expenditure of energy in overcoming the electrostatic field
- D. expenditure of energy in liberating electrons from the mercury
Explanation
The cathode fall is the energy needed to liberate electrons from the mercury surface and establish emission at the cathode spot. It is therefore associated primarily with electron liberation rather than ordinary surface resistance.
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