what happens to the brightness of light emitted by a lightbulb when the current that flows in it increases?
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.
38522
1. flow of electrons\n2. mechanical energy\n3. motor, lightbulb\n4. the rate of flow of electrons
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.
695376
The resistance of the filament of the lamp varies with temperature. When the filament is at room temperature the resistance is much lower than when it is white hot. \n\nCurrent = V/R. If the voltage is constant and the resistance increases, the current decreases.
25404
See "How Light Bulbs Work":\nhttp://science.howstuffworks.com/light-bulb.htm\n\nThe full answer is:\n\nLight bulbs have a very simple structure. At the base, they have two metal contacts, which connect to the ends of an electrical circuit. The metal contacts are attached to two stiff wires, which are attached to a thin metal filament. The filament sits in the middle of the bulb, held up by a glass mount. The wires and the filament are housed in a glass bulb, which is filled with an inert gas, such as argon.\n\nWhen the bulb is hooked up to a power supply, an electric current flows from one contact to the other, through the wires and the filament. Electric current in a solid conductor is the mass movement of free electrons (electrons that are not tightly bound to an atom) from a negatively charged area to a positively charged area.\n\nAs the electrons zip along through the filament, they are constantly bumping into the atoms that make up the filament. The energy of each impact vibrates an atom -- in other words, the current heats the atoms up. A thinner conductor heats up more easily than a thicker conductor because it is more resistant to the movement of electrons.\n\nBound electrons in the vibrating atoms may be boosted temporarily to a higher energy level. When they fall back to their normal levels, the electrons release the extra energy in the form of photons. Metal atoms release mostly infrared light photons, which are invisible to the human eye. But if they are heated to a high enough level -- around 4,000 degrees Fahrenheit (2,200 degrees C) in the case of a light bulb -- they will emit a good deal of visible light.\n\nThe filament in a light bulb is made of a long, incredibly thin length of tungsten metal. In a typical 60-watt bulb, the tungsten filament is about 6.5 feet (2 meters) long but only one-hundredth of an inch thick. The tungsten is arranged in a double coil in order to fit it all in a small space. That is, the filament is wound up to make one coil, and then this coil is wound to make a larger coil. In a 60-watt bulb, the coil is less than an inch long.
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).
36631
B. the current will increase
870781
a light bult emits the same amout of light in a dark room as it does in a bright room.  Your eyes, when adjusted to dark, allow more light in and it seems brighter.
114930
I'm assuming that the current is not changing with time other than the initial turn-on transient.\n\nWhen the current has reached a steady state (didn't say reached zero, but some final state), you are in the area of electromagnetics called electro/magnetostatics and the magnetic and electric fields are uncoupled. For the situation that you describe (I'm assuming no stationary charges external to the wire), the Electric Field Density is zero.\n\nYou might be tempted to use Gauss' Law to find the Electric Field from an individual electron as it moved down the wire, but the summation at any particular point in space from all charges moving in the wire will sum to zero.\n\nWhen the current is first turned on you will have a changing magnetic field and therefore an electric field. However, that electric field will die away rapidly.
516794
Imagine having a torch, which you have turned off at the moment, then turn it on and then off again. You just generated a pulse of light. Well an electronic pulse is just the same, but it's a pulse of current, rather than an pulse of light.
192201
In an electric torch the bulb glows when we switch on the circuit and bulb glows off when we switch off the circuit. \n\nGlowing of bulb is the indication that the current is in the circuit. When there is no current the bulb will not glow.\n\nWe use the cells (Battery) as long as it has life.  The cells have electric energy and they are used when we want. When it is not used, (switch off position) there is no current in the wire connecting the bulb.\n\nThe differences between this and the power supply through lines to the buildings are not much.\n\nIn the latter, instead of direct current, alternating current is used; instead of small power huge power is used.\n\nTherefore when the switch is in off position there is no current in the lines, but they are full of energy and at any time they can produce current when the switch is on.\n\nAn analogy with water tank may be useful.  Water is stored in the tank. Whenever we open the pipe water flows in the whole pipe connecting the tank and the end pipe, when we close the pipe no water flows but water pressure will be there.
349738
i=v/r\n\ni=current\nv=voltage\nr=resistance\n\nThink of it as a hose full of water. The current is the amount of water going through the hose. The voltage would be the pressure of the water, and the resistance would be the diameter and the length of the hose. So obviously if you have a huge pressure on a huge diameter hose, you are going to have a huge current. But if your resistance is very high, like say the hose is just a little straw, then even with alot of pressure the current will be pretty small. And same thing the other way around. If you have a really big pipe, then you only need a little pressure to move alot of water.\n\nElecricity works the same way, except that resistance is not so much the wire as is the appliance in the circuit. So you might say that a light bulb has a certain resistance that causes a certain current when hooked up to a 12 volt power source.
814978
The resistance of the filament will increase as it heats up. So you're going to get something called a "transient", which is when the initial value will stabilize (to the working current in this case), after a period of time.\nA lower starting resistance equals a higher starting current.
681841
Same principle as neon lighting.  With a neon light you have a gas with current passing through it causing it to emit off a light.  In this case it sounds like a concentration of whatever the specific gas happened to be in the air at the lightning strike, and what you saw was the gas emitting it's light.  Anyone happen to know what gas gives off green light in neon lights?
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
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
332581
Battery in series arrangement will have a combined voltage(force) to push more current to the bulb.\nFor simple analogy, It is similar to water level in a narrow container gaining pressure at the bottom the more you add water. Parallel arragement is similar to increasing the volume of water without changing it's height thus maintaing the same pressure at the bottom.