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Answer Posted / bhadrappahr
Fluorescent tube is a gas discharge lamp. It consists of two
filamentary thermionic electrodes mounted at each end of
glass tube. The tube is filled with an inert gas like
mercury at low pressure and sealed. A high voltage is
necessary to start conduction through the tube. To obtain
this high voltage during starting an iron cored choke and
glow type starter are connected in series with filaments.
When the supply is switched ON an arc is struck between the
starter electrodes which causes a current to flow through
the choke and filaments. The filaments get heated up and
emit electrons. After a few seconds the starter electrodes
separates and due to this separation current is interrupted.
This interruption causes high voltage to be induced in the
choke which appears across the filaments of the tube
resulting in discharge through the tube. The gas inside the
tube is ionized and the ionized gas emits ultra-violet
radiation which is absorbed by the fluorescent material
coated inside of the tube this in turn emits light
radiations causing the tube to glow.
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