how is CFL bulb made?how it became economical?
830929
Compact fluorescents are very like ordinary fluorescent bulbs (see refs.) but with smaller, coiled tubes and reduced-size electronic components (starter, ballast) hidden in the base. The price has fallen because of the huge volume they are now made in. They use less power for the light they produce because the light energy is emitted from an ionized gas (and converted to visible light by the phosphor coating inside the bulb) instead of from a heated wire as in conventional light bulbs. This is a more efficient process because it generates far less useless heat, which you can confirm for yourself by feeling one and comparing to the very hot conventional bulb. They also save the consumer more money by having a very long lifetime, typically 10,000-20,000 hours compared to 500-2000 hours for conventional bulbs. Another advantage is that they don't heat the socket they are screwed into nearly as much, resulting in longer socket life too.
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.
547995
This is completely dependant on the atomic structure of the source filament. Once at capacity, the atoms will only give off photonic energy at a specific rate that is inherant to that specific type of atom. Most household filaments are designed to handle standard electrical current,without being at full capacity (atomically).\n\nSo in a standard household bulb, it will release more photonic energy and appear brighter.\n\nIf it is already operating at max capacity (atomically)\nthen there will be no change to the appearance of the bulb, because the atoms are already filled and giving off photons as fast as possible.
63793
I'd say the easiest is e-bay to start, and it might prompt you to find something bigger and better.  I live in a place where Caladiums are a big (not really big, but big for this town) industry and it would be nothing to buy Caladium bulbs for next to nothing and sell them on E-bay.  So finding a shippable item in your area to start, then making your own website and then your own catalog and so on.  Learn as you go.
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
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!
909018
Actually Chameleon is right. Despite the fact that a lightning bolt lasts only fractions of a second, the average bolt transfers almost 500 megajoules of energy. Thats enough to light a 100-watt light bulb for about 2 months.\n\nAs for harnessing the power behind lighting, it can be done on a small scale. Look at a Vandegraaff generator which uses a belt and metal dome to create electric charge. As for the lightning that comes from storms. It is surprising to realize that it is quite unpredictable to human kind at this point, and the thought of being able to control lightning on that large of a scale is simply not feasible at this time.\n\n-Christopher
846673
The light bulb uses energy and the energy after a while get hot. If you touch 650 watt or higher it will burn out like that, because the chemical in the bulb are keep the filament on the wire because it get way too hot. The Chemicals get use to your body heat and cool down real fast. It leaves a real cool black/grey bump on it but those bulb cost 20$$ each. They are make for lights that need to be on for a while or need to last for a long time, light street lights.
934027
I'd probably choose luminescent due to the cheapness and effectivity of the lightbulb; I personally don't like the light a incandescent light bulb gives off.
883981
If you really want to be technical about this then here you go:\n\nHere are the three main consideration you have to follow when making a flashlight:\n\n1.) Amount of current the bulb will draw:\nI standby this clearly to show that current draw will affect the size of the wire that you will use to power up the bulb.  If your bulb draws lots of current from the source, then you will want to use a bigger wire.\n\n2.) Safe wire colors\nSecondly you have to consider safety standards as well.  You can't simply start to wire up the flash light and put the red wire on the negative end of the battery / power source.   You can possibly confuse someone, if they intend to repair it. \nThus in DC CIRCUITS ONLY\nRed = Positive Voltage w/ respect to GND\nBlack = Ground
421598
The answer to this question will vary depending upon the light source you are referring to.\n\nAn incandescent light bulb emits light through black-body emission as the filament is heated by running electricity through it.  As long as the electricity is provided to the filament at a constant rate, the amount of light coming out will remain constant.\n\nA fluorescent light bulb emits light through fluorescence (imagine that).  As the electricity passes through the tube electrons will collide with atoms (often mercury vapor)   and excite them.  These excited atoms emit light when they transition back to the unexcited state.  If electricity is provided at a constant rate, there will be a constant number of atoms in the excited state at any given time, and the light emitted will remain constant.
433870
make and working elctric circuit like a bell, r a bulb, u can Also explain working of an electromagnet using a model.\nu can also expain the capillarity concept
629262
http://en.wikipedia.org/wiki/Light_bulb#History_of_the_light_bulb
951468
There are a number of products on the market that will do what you want, and be certified and safe.\n\nMake sure you get a warm LED though: cool white LEDs produce a terrible colour of light.\n\nhttp://www.theledlight.com/120-VAC-LEDbulbs.html
588135
Old flourescent lamps needs a starter switch because flourescents bulbs are made of enclosed mercury, argon and phosphor. Electrical current can flow freely through the tube but it will not light up. When you hit the starter switch it produces an arc, then electrons collide with the atoms and other gases to produce a plasma. Today, we have the rapid start lamp. Same principle, but it doesn't have a starter switch. Instead, the lamp's ballast constantly channels configured current flow resulting a voltage across the tube to heat up electrode filaments very quickly, boiling off electrons, which ionize the gas in the tube. Then the voltage difference between the electrodes establishes an electrical arc to turn on flourescent lights.
613962
Since you mean the light bulb is good, then a whoosh of the gas Argon will come out of the bulb.  If you were careful, you could do this without breaking the bulb.\n\nDon't try to do it unless you wear protective eyewear and hand protection!  The bulb is under some pressure; it is not a vacuum.
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