the glass becomes hot when an electric bulb is kept switched on.it is not so in the case of tube light. why?
928685
An electric INCANDSCENT bulb uses a tungstene filament (twisted wire) that is heated by the current passing through to several hundred degrees.  It is this heat that heats the glass.  It is also the proof of inefficiency of the bulb, because it is transforming 80% of the energy it receives into heat, giving only 20% for light!\nIn the FLUORESCENT tubes, the light is produced by the ionisation of the internal gas (neon or argon).  This ionisation is initiated by heating two small filaments at teach end of the tube, that heat up a small drop of mercury.  Once the mercury is vaporised inside the tube, the "starter" opens, creating a high voltage puls across the whole tube, ionising the gas that then becomes conductor: a small current passes through the gas, and the filaments are disconnected.  Since the ionised and conductive gas has nearly no resistance, the current is limited by the "ballast" (an inductor inserted in series).\nSince the CURRENT is limited, there is no "Joule Effect" (heating) and the tube stays pretty cool.\nTheir efficiency is about 100 times more than a bulb... (in terms of power/light ratio).
95862
it gets hot, which in turn causes more resistance, and it gets even hotter, which causes more resistance.  if there are enough amps, the metal will melt.
309604
NO.  When the lightbulb burns out the filament breaks.  The filament is what the electricity flows through to create light.  When this breaks there is no path for current to flow, therfore no electricity is used.
215554
Sounds kind of dangerous, I'm not sure. Depending on how old it is and what type of tv it is, it could be an exploded tube or fried wiring!
735946
An incandescent bulb usually has a vacuum inside. Sometimes it has argon in it. While it is on, the tungsten in the filament is evaporating from the heat until finally the filament gets so thin that it breaks and the bulb is useless.\n\nA halogen bulb includes a halogen gas in it. While it is on, the tungsten in the filament is evaporating from the very high heat that these bulbs are operating at. However tungsten vapor evaporating from the filament combines with the halogen gas so that the filament is rebuilt when the tungsten lands on it and does not burn through. That lengthens the life of the bulb and the higher temperature also gives a brighter light for the same wattage. More light, more life, less operating cost.
237211
It gets hot.  Hate to be so simplistic, but that's what will happen.  A wire has almost no resistance and virtually all of the energy in the battery flows from one terminal to the other.  The flow heats up the wire and, well, it gets hot.  The larger the battery, the faster this will happen.
158482
It may be because of the electricity fluctuation. Or their may be a problem with your monitor's picture tube.
168586
The light bulb uses radiation which is not as effective as convection in this case.
1176231
Generally, light is created when energy is released, usually in the form of heat. The reason a light bulb works is because electricity (energy) is forced through something with higher resistance (the filament inside the bulb). This creates heat and as a by product, light.
507766
depends on the type of bulb, For incadesant bulbs thee is NO extra power required, they get hot, they glow. For florescent tubes it can be quite long, certainly of the orer of hours. once up and running they use very little
43511
I think you are asking, why do light bulbs often burn out just when you turn them on, not a few minutes or hours later.\n\nThat's because of what happens to the filament of a light bulb as it ages, as explained here:\nhttp://members.misty.com/don/bulb1.html#wbt
907449
Two- one to change it, the other one to scratch its bottom. :-)\n\nHow many economists does it take to screw in a light bulb?\n\nNone. If the light bulb really needed changing, market forces would have already caused it to happen.
818868
I suspect this refers to how flourescent light bulbs generate a quasi-continuous spectrum as opposed to the discrete emission lines like other self respecting plasma discharge tubes.  \n\nHere is a website that has several pages on Flourescent Lamps:\n\nhttp://home.howstuffworks.com/fluorescent-lamp.htm\n\nThe first two or three are the ones useful to you.  Also there are several links on the last page under More Great Links that will help you in your researches.  Happy hunting!\n\nBTW: This reeks of an intro science class lab write-up question.  TAs at help desks or profs during office hours can help a great deal more effectively than something like yahoo answers, if you want to truly understand.
862716
You probably have a problem with your wiring.  CALL AN ELECTRICIAN TO CHECK EVERYTHING OUT!  I know it sucks financially, what with it being the "chirstmas shopping season" and all, but what if you have a serious problem and it causes a fire...you could lose a LOT more than your things...people could get hurt.  Don't risk it!
800526
By electrickery of course! Nah basically in layman's terms the electrical energy passing through the gas inside the tube causes the gas to give off photons of light. There is no wire element getting hot and glowing, just gas. Different gas equals different colour light think of "neon lights". Others stuff is also put in along side the gas such as metal elements and often sodium. Street lamps are usually "sodium" bulbs. If you want to find out more use the term "gas discharge lamp" or similar and you'll be more successful in your searches.\n\nthis is worth a look http://en.wikipedia.org/wiki/Gas_discharge
378224
When a strong electroltye is seperated (dissociated) in water, it seperated into both negative and positive charges, these charges are attracted to the electrical conductors to give it energy to light a light bulb. Try it with salt and water, like NaCl.
703428
It used to be like that with fluorescent lights only, but not anymore.  See this article.\n\nhttp://www.eweb.org/business/energy/energysmart/ebd/9811/lighting_myth.htm