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identify the components of the tube light and explain how
they function???wat is inside the fluroscent tube???how it
works???
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Answer Posted / princess
A fluorescent lamp works by striking an arc between the two
electrodes at the end of the tube. This arc passes through
the gas that is filled inside the tube. The emissions from
the arc hit the fluorescent coating on the inner surface of
the tube to produce light.
A high voltage is required to strike this arc. This is
produced by the choke. The choke is nothing but a coil
wound over a core; in other words, an inductor. When you
switch on the tube light, the sudden surge of current
induces a back-EMF across the choke. This voltage is
applied across the electrodes of the tube light and it
strikes an arc.
Once the arc is struck, the current flows through the gas
inside the tube. There is no further point in letting it
flow through the choke after the tube glows steadily, as
this would only result in losses. Therefore, the choke
needs to be cut-off after the tube light glows steadily.
This is done by the starter, which cuts off the current
through the choke after some time. (It allows the current
to flow through the choke only during the starting, and
hence it is called a starter).
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