How do light bulbs work?
595595
eletricity pasess through a metal wire and then pasess through filiment which not alot of electricity can pas so it is given off as heat and electricity that does make it through goes down another metal wire.
831388
Light Emitting Diodes and How They Work.\n\nhttp://electronics.howstuffworks.com/led.htm
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
1057725
As electricity flows into certain atoms (which make up LEDs), energy is transferred to the electrons in the atoms.  Those electrons absorb energy and rise to a higher excited state.  At some later point in time, those electrons fall to a lower energy state.  The difference in energy between the higher state and the lower state is emitted as a photon.  The amount of energy in the photon determines the color.
603423
Electric light is produced by running an electric current through a resistor that then glows white-hot.  Edison searched through thousands of different materials to find one that glows just right.\n\nToday most regular light bulbs use a tungsten filament (a little wire made of the material 'tungsten') which gives off a lot of light but it is relatively breakable.\n\nWhen a bulb 'burns out' it means that this little filament has burned up or broken.  It is more likely to break when it is turned on.  Technically I suppose you could get more life out of a bulb by leaving it on all the time but that would be a waste of energy and you don't want light all the time.\n\nThese days there are other materials and other ways to make light bulbs that last a lot longer but they are not in common usage yet.
1060183
Edison invented the light bulb. It was a bit of inspirational genius that took many tries before he got it right. The idea was good but putting in all the effort to make the idea work was how the inspiration became genius.
78570
How would blondes ever get into a light bulb in the first place?
840318
Light bulbs have little air in them so if there was a tiny crack in the bulb, only a little random pressure would be needed to cause air pressure to rush into the bulb, causing it to implode with a bang.
798595
The light-bulb has a tungsten filament, which has electrical resistance.  The voltage applied across the resistance causes a current to flow.  The value of the current is: I = V/R, where I is the current in amps, V is the voltage in volts, and R is the resistance in ohms.  The current flowing through the resistance causes it to heat up--it dissipates power.  The power is: P = I*V, or P = R*I^2, where the power is in watts.  MOST of that power produces heat; in an incandescent bulb only a little goes into light.  Power, incidentally, is energy per unit time.  Watts are Joules/sec, where the joule is the SI standard unit of energy.\n\nAs for the motors, connect them in parallel.  They will each receive the same voltage, and each will draw the amount of current it needs.
88246
If u meant what solution would conduct electricity then any salt solution would do  the trick. If you meant what solution would produce electricity to light a bulb then you need to prepare a dilute solution of sulphuric acid ( be careful! wear gloves! Wear goggles! If you are a kid, do it under supervision of an adult..that means your parents or teacher :-) ) In the acid solution suspend two plates of dis-similar metals ( say zinc and copper) and connect the plates to the bulb( a flash light bulb, 1.5 V) using copper wires..and see it glow.\n\nThere are other ways and more elegant styles..however this is the simplest.
734064
From How Stuff Works:\n\n"A three-way bulb has two filaments in it. The next time one burns out, carefully open it (for example, wrap it in a towel and hit it lightly with a hammer) and you will see the two separate filaments. \n\nFor the lowest setting, one filament comes on (it might be a 50-watt filament). For the next setting, the second filament comes on (it might be a 100-watt filament). For the third setting, both come on, for (in our example) a total of 150 watts. \n\nLook also at the end of the bulb's base -- you will be able to see how the lamp controls the two filaments. "\n\nAlso:\n\n"A three-way bulb has two filaments of different wattage -- typically a 50-watt filament and a 100-watt filament. The filaments are wired to separate circuits, which can be closed initially using a special three-way socket. \n\nThe switch in the three-way socket lets you choose from three different light levels. On the lowest level, the switch closes only the circuit for the 50-watt filament. For the medium light level, the switch closes the circuit for the 100-watt filament. For the brightest level, the switch closes the circuits for both filaments, so the bulb operates at 150 watts."\n\nHope this "brightens" your day!
223171
The same way all lasers work.Light energy is bounced back and forth within the structure of a certain material (rubies work) until the atoms are "pumped" into an excited state.  When the atoms of the material are excited enough, they emit light of only one wavelength (coherent light).\nCoreherent light will travel out whatever size aperature the device has, and not be inclined to spread and dissipate the way full spectrum light does.
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
1079558
they work well.  I live in PA, and there is not much sunlight for most of the winter.  Wegmans, and most health food stores carry the light bulbs.  They are generally billed a "full-spectrum light bulbs."  \nNone of my family have SAD, however I definitely notice the mood change in my family when I buy them.
28379
Switch on the first switch, leave it on for a minute, then turn it off. Switch on the second switch, leaving the third untouched - and go into the room. If the light is off, touch the lightbulb to see if it's warm. If it is, that means the first switch controlled the bulb. If the light is on, that means the second switch controls the bulb. If the light is off, and the bulb is cool, that means the third switch controls it :)
94323
The phosphors\n\nhttp://www.sylvania.com/BusinessProducts/MaterialsandComponents/LightingComponents/Phosphor/FluorescentLamps/\n\nhttp://www.lgchem.com/en_products/electromaterial/display/phosphors/pdp_flor.html\n\nHow the bulbs work\n\nhttp://home.howstuffworks.com/fluorescent-lamp2.htm\n\nhttp://nemesis.lonestar.org/reference/electricity/fluorescent/lamps.html
326683
The incandescent bulb (which hopefully will become ancient paraphenelia in a few years) produces light by heating a tungsten wire white hot. At these temperatures, most materials "re-crystallizes" or moves.  "Hot spots" can develop that eventually lead to the failure of the filament, i.e. it breaks. When they break, they can rattle inside the bulb when you shake it.