how fluoroscent lamp works?
343350
with the aid of a ballast which controls current to each side of the bulb and the bulb is filled with a luminescent gas that when heated will illuminate
1026089
1) the rheostat (that little knob that increases or decreases the light coming from the light source)\n\n2) the iris diaphram (works like the iris of the eye, making bigger or smaller circles for the light to pass through)--this is usually part of the condenser
966920
Compact Fluorescent Lamps\n\n  ************************************************************************\n  *                  COMPACT FLUORESCENT LIGHT BULBS                     *\n  *                                                                      *\n  *                       **** Version 1.10 ****                         *\n  *                                                                      *\n  *                      Copyright (C) 1996, 1999                        *\n  *                        Samuel M. Goldwasser                          *\n  *                        Donald L. Klipstein                           *\n  *                                                                      *\n  *        Corrections or suggestions to: sam@stdavids.marconimed.com    *\n  *                                       don@misty.com                  *\n  *                                                                      *\n  *                     --- All Rights Reserved ---                      *\n  *                                                                      *\n  *    Reproduction of this document in whole or in part is permitted    *\n  *    if both of the following conditions are satisfied:                *\n  *                                                                      *\n  *     1. This notice is included in its entirety at the beginning.     *\n  *     2. There is no charge except to cover the costs of copying.      *\n  *                                                                      *\n  ************************************************************************\n\n...\n\n8.  Like other fluorescents, operation at cold temperatures (under around\n    50 degrees F) may cause reduced light output or erratic operation.\n    Some models work fairly well down to about 35 degrees F, others may\n    get noticeably dim below 60 degrees F.  The optimum temperature range\n    of a particular lamp may vary with burning position, generally\n    preferring cooler temperatures if operated base-down.\n    Compact fluorescents may also not like excessive heat.  Some ballasts\n    are unreliable in ambient temperatures much over 120 degrees F.  This\n    is sometimes a problem in enclosed or recessed ceiling fixtures if\n    heat in the fixture builds up.
929481
You need to wire them in parallel, with wire heavy enough for the total current and also have a battery that can deliver the current required at the voltage required without voltage drop.  You don't state the battery voltage or the lamp wattage, so I cant work it out for you!\n\n(I take it that you want EACH of the three bulbs to be as bright as one single one?)
172519
Sorry....that is not correct.  LCD's do NOT emit light.\n\n\nYou see LCD technology does not itself emit light. you either must have enough ambiant light to see, or it must be 'back-lit'. The Technology formmerly used to do this was CCFL or Cold Cathode Forescent Lamp, these failed in 2 different ways as they aged.\n\n1. the light would get darker as it aged. Some would even change color therby messing-up the colors the display rendered.\n\nand\n\n2. As the bulb ages, it requires more and more power to engergize it. Eventually it will reach a point where the amperage required to start the lamp, will exceed the capacity the circut it is on can provide and simply not light.\n\nIf you've ever seen this, or suspect that this is your problem (display won't light, or goes dark shortly after starting,) simply shine a bright light source directly into the display, you should see faintly whatever the desktop was diplaying at the time.....or your desktop if it never came on to begin with.\n\nCurrent Backlight technology uses white LED lights....far better.\nthe BEST ones use 3 LED lights....1 each of Red Blue and Green, much much better at displaying the full color spectrum.\n\nHope that helps !\n\nPS: the FLASHLIGHT you have.....is an LED flashlight, I would wager. I have one too, they're great !  $27 bucks though.\n\nPPS: more like 100,000 hours.\n\n\nto poster below....the current back-lighting method IS LED, the fact that it is also used in Thin Film Transister Displays does not really make a difference to this question.\ncheck your facts. oh and your 'plasma' info is waaaaaay off.\none year!  ha.
790269
Touch lamps work off of capacitance sensing.  when you touch it with your body you add capacitance (the ability to store electrical energy) to the circuit.  If you touched it with a metal rod it would work, wood.. nope.. plastic.. nope.. needs to be something conductive
943748
use voltage dividers with a transistorized switch.  this method lights  a number of lights matching the input voltage in this case, all the way up the tree to it, rather than just one, so note that.  (7V in gives 7 lamps on).\n\nthe first transistor comes on if the base reaches .7V (2N2222 or so will work).  the next transistor is attached to the base of the first transistor through a voltage divider, the third ....  From the collector stick in a 1V Zener for regulation (make sure you get one that withstands 12v in), and the lights then go from there straight to ground (include a resistor here to limit current, try 15 ohms to start, experiment!).\n\ndecide how many lights you want, divide your final voltage by that number, and that is the voltage per step (here, 1V).  the voltage divider then comes from the voltage per step versus the transistor base ON voltage, across a good sized resistor (say 470 ohms or 1k, whatever you want (watch the current and the power drain here).  in your case, if you use a 470 load resistor on the voltage divider, then the second leg of the divider is (470 / (1V/1V-.7V)) = 141 is about a 130 (less is more on the base!).\n\nrecap:\n\nso the voltage divider goes from the input into the 130, into both the base and the 470, the 470 goes to ground.  the emitter can tie to the input voltage, the collector goes to a 1V Zener, to a 1V lamp, a small resistor, and ground.\n\nthe other stages stack right onto this.  the input still goes to the 130, then to the base and the 470, the 470 ties to the base of the previous stage.  the emitter again goes to the input voltage, and the collector goes to a 1V Zener, a 1V lamp, and a small resistor to ground.  sorry, i can't attach a picture here.
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.
823896
did you mean how does a light sensor work?
613982
Old fluorescent tubes, which required a ballast to start, used a bunch of electricity to turn on - but a small amount of electricity to keep them on. So it was more economical to leave them on rather than turn them off for a few hours.\nImprovements in design have eliminated that anomaly and there is now little difference in the power needs to start and maintain the bulb.
773220
When push squeeze the bulb (this is the force), you exert pressure EVERYWHERE in the dropper, (upwards, downwards, etc), so the liquid in the medicine dropper it forced to come out since in the increase in pressure is applied everywhere,\n\nThis is known as pascal's principle
657073
electricity passes through the wire in the light bulb. as it goes through the curved part, it heats up because it has to push its way through ( meatphorically speaking). By heating up it emits thermal energy (heat) and light energy, and thanks to this, you can read this answer at night, all for this moment. ;)
359925
No.  This is an old "urban myth."  The amount of energy used by the bulb is the rated watts.  So, for an equal number of lumens [the "brightness" of the bulb] fluourescent lamps use fewer watts.  And if you're buying a new fixture, check to see the different color ratings of fluouresecent bulbs, too.  They don't have to make you look like a corpse anymore.\n\nAnother way to look at it is that incandescent lamps use resistance to overheat a solid chunk of metal until it glows.  That takes a lot of energy. Fluourescents send an electrical charge through a cloud of gas to excite individual molecules.  I'm not a physicist, but that sounds a bit easier to do.
526210
The stuff inside is a wax that gets heat up by the bulb on the bottom of the lamp. Wax and water don’t combine so that is why it doesn’t mix. When the wax get hot enough it becomes lighter than water, as it hits the top it cools of and floats on back down.
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).
106923
it's usually called tube lighting
571854
Both are kind of fluorescent lamps. Electrical energy in the form of an electrical current from the ballast flows through the gas, causing it to give off ultraviolet light. The ultraviolet light then excites a white phosphor coating on the inside of the tube. This coating emits visible light. \n\nTubelight is an early form of fluorescent lamp and are larger in size and use magnetic ballast. CFLs are recent avtars of the same - compact, with electronic ballast and more energy efficient.