Mercury Vapour Lamp Homework Help, Assignment Help, Online Tutor, Tutoring

Submit Assignment

* *

Payment Online Assignment Help

Thermodynamics

Homework Help

sfsf

Mercury Vapour Lamp

It consists of two bulbs P and Q. The space between P and Q is evacuated. The inner bulb P contains a small quantity of mercury and argon. E₁ and E₂ are two electrodes and S is a starting electrode. S is connected to the remote electrode E₁ through a high resistance R. An A.C. source of 50 hertz is connected between the points a and b.

In the beginning, when the mains voltage is switched on, a potential difference is introduced between E₂ and S. Ionization of argon takes place between E₂ and S. After sometime, ionization of argon takes place between E₁and S. The lamp warms up and mercury vaporizes gradually. The pressure inside the bulb increases. When the discharge takes place between E₁ and E₂ mercury glows with greenish blue colour. This lamp is commonly used new-a-days.