Working of florescent lamp
Construction.
The lamp consists of a glass tube with filament electrons
shields into each of its ends. Its filaments are made of tungsten wire and are
coated with material which has the ability to hermit electrons. inner surface
of the tube is coated with a thin layer of
florescent powder which is a mixture of
various material as like(Ca , Z , Cd )etc. during the manufacturing of
the lamp most of the air is removed from the tube small amount of argon gas and
one or two drop of mockery are field inside it.
Main parts
Choke
It is made of wires
which a wound on laminated core .the main function of the choke is to develop
high voltage normally three to four times higher than the normal supply voltage
and reduced it from that higher value when the light is turn on.
Starter
The main function of starter is to make the on and of
circuit. it is made by using of bimetallic strip. And a small tube which field
of helium gas and a condenser is also connected in the parallel to reduce the
sparking starter are mainly divided in two types1. Thermal type starter
Thermal type starter
make and break circuit on base of temperature.
so its name is thermal type starter.
2. Glow type starter.
It is not based on temperature.
Condenser
It is a device witch work to store the electrical energy. It
is connected in parallel with the circuit. It is used for reduced the sparking
from whole circuit
Working of florescent lamp
When the main supply is torn on, with the help of choke and
starter a high voltage is applied to the tube and due to the heating of
filament the organ gas is discharged and work as conductor and electrons start
flow in the tube. the ultraviolet rays which are produced in the tube are mad
comfortable to see by the thin layer of florescent powder in the inner side of
tube the florescent tube light gives the light of 30 loudness/ watt .
Advantage of florescent lamp
1. Florescent
lamp is 66% cheaper than other type of lamp and it provide more brightness than other.
2. Its
construction is simple than other and more reliable.
3. Its light is
not giving heat in case of other lamp heat is also produced.
Disadvantage of florescent lamp
1. Its
electrical connection of more complex.
2. It is more
costly than other.