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Q.

Why choke coils are used in tube light?

Tags: light, tube, coils
Asked by kusuma, 28 Mar '08 05:01 pm
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Answers (2)

1.

In a gas discharge, such as a fluorescent lamp, current causes resistance to decrease. This is because as more electrons and ions flow through a particular area, they bump into more atoms, which frees up electrons, creating more charged particles. In this way, current will climb on its own in a gas discharge, as long as there is adequate voltage (and household AC current has a lot of voltage). If the current in a fluorescent light isn't controlled, it can blow out the various electrical components.

A fluorescent lamp's ballast works to control this. The simplest sort of ballast, generally referred to as magnetic ballast, works something like an inductor. A basic inductor consists of a coil of wire in a circuit, which may be wound around a piece of metal. If you've read How Electromagnets Work, you know that when you send electrical current through a wire, it generates a magnetic field. Positioning the wire in concentric loops amplifies this field.

This sort of field affects no ...more
Answered by Sheetal Kaur, 30 Mar '08 04:08 am

 
  
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2.

Tube light or fluorescent tube is a low pressure mercury vapour lamp. Light is produced when current or more specifically electrons travel from one end of the tube to the other end through the mercury vapour inside the tube. This can happen only when the mercury vapour is ionised and this is done by momentary applying a high voltage between the two ends of the tube.

This momentary application of high voltage is done by the choke coil along with the starter. When a tube light is switched on, current flows through the choke coil and starter and after a few seconds the starter switches off the current through the choke. The magnetic energy stored in the choke coil due to flow of current gets converted into electrostatic energy in the form of a high voltage which is applied across the tube light.

If you want to know more please visit this site :
http://en.wikipedia.org/wiki/Fluorescent_lamp#Principles_of_o peration
Answered by abhi, 29 Mar '08 08:29 pm

 
  
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