Is there a vacuum in a light bulb?
452914
No, they are filled with an inert gas, such as argon.
354917
my Mighty Mite vaccuum cleaner.  It can suck up a sock from across the room.  I owned one before, it lasted 10 years and was under $100.  Now I have the model with a HEPA filter.  Worth every penny, 10 times better than any upright.
55888
There is the possibility of creating a partial vacuum, which makes removal problematic. 'Nuf said?
224831
Not enough to screw in a light bulb.
306346
I guess so.. That's kind of stupid though. Why would you want to change a lightbulb with your feet? Once you get the bulb situated to where it stays in the socket without falling, then it would be pretty easy to keep it rotating until the electricity can circulate throughout the bulb. Try it...
511459
Good question large man. The reason for this is because when the vacuum is running and you have a little piece of garbage in your hand you can either turn off the vacuum (or leave it running) and walk to the garbage. Or you can stuff a little piece of dirty floor garbage in our pocket, sound nice? Also, people understand intuitively that the reason the vacuum didn't get the string was because it had been worked into the carpet a little, and the vacuum had just made it worse so far, picking it up and putting it down again just undid that, so the vacuum has a good shot now. Personally, i pick up the vacuum nozzle and put the string right in the little hole. If i was a little smarter, i might realize that there is a little opening in the shaft that i could put it in. That's probably what the little opening is for anyway. I don't know. Good follow up question: "What the hell is that little slidey opening on the shaft a of a vacuum for?"
474124
either your teacher is nuts or you probably know more about this than us. the bulb has to be a vacuum, and making a glass vacuum requires better equipment than most people have access to.
324864
Actually, There is no such thing as a true vacuum...Period!\n(exerpt from a previous answer)\nContrary to popular belief, empty space is not empty, and it is certainly not a vacuum. In fact, a true vacuum has never been created, anywhere, where the atomic count is zero.\nresearch it, its true.\n"Empty" space actually contains an average of 1 hydrogen atom for every 32 cubic centimeters of space, this data is per NASA.\n\nIn our own Milky Way, space is more dense with 1 hydrogen atom for every 1 cubic centimeter.\n\nOne day the misinformation of space as a vacuum will finally die out.\n\n\nspread the knowledge
516877
The incandescent light bulb or incandescent lamp is a source of artificial light that works by incandescence, in which an electric current passes through a thin filament, heating it and causing it to emit light. The "bulb" is the glass enclosure around the filament that often contains a vacuum or is filled with a low-pressure noble gas to prevent the filament from burning out due to evaporation at the high temperature.\n\nIncandescent bulbs used to be known as electric lamps, extending the use of a term applied to the original arc "lamps", and in Australia and South Africa they are also called light globes. Because of their relatively poor energy efficiency and yellowish color, incandescent light bulbs are gradually being replaced in many applications by fluorescent lights, high-intensity discharge lamps, LEDs, and other devices.
316405
If your talking about regular incandescent bulbs in residential lighting fixtures, then its just the filament size and material that produces different levels of brightness.  For a given bulb, if you want to make it brighter/dimmer you can lower the voltage applied to the bulb.  Regular bulbs run on 120 volts.  There are dimmer switches for home lighting that get installed in the wall, but you can also get certain extension cords that have a variable resistor built in to allow you to control the voltage applied to the bulb, thereby affecting the brightness.
1073127
A lightbulb is a very cheap effective producer of heat!  Use something like a 15 to 25 watt bulb and make sure it holds the temperature steady at the correct level so you don't fry your eggs or they don't get cold.\n\nBTW a 100W lightbulb gives off 2% of the energy in light and guess what the other 98 watts are?  HEAT!
1126516
Yes, but there will be no sound, because of the vacuum.  It would explode with light, heat and radiation but little else.
403379
Standard light bulbs contain a tungsten filament connected to electrical contacts inside a vacuum so that there is no (or very little oxygen).  When electricity flows through the high-resistance filament, the filament glows white hot, giving off light and heat.\n\nOther types of light bulbs (fluorescent, halogen, etc.) work a little differently.  If you want information on those, just say the word.
941040
I believe the light bulb would light up the sphere, like a lamp shade, You'd see the light but not the light bulb. The metal particles that are in a one sided mirror allow some light to come through.
157673
Vacuum\n\nElectromagnetic waves are self propigating, so they do not require a medium in which to travel through.  This is how light (and other EM waves) can travel through empty space.
714173
There cannot be a true vacuum in quantum mechanics. There are always spontaneous creation-annihilation events of subatomic particles (mostly positron-electron events). Any matter bounding the vacuum emits radiation (light) and that will rapidly form a photon gas in your vacuum. This is simply inevitable.
975896
Energy is measured in watts, so I assume you mean a voltage source of 200v.\n\n(1)\nThe voltage source of 200v applied to the light bulb (laminar) will be 200v.  Since the light bulb is designed for 130v, the supply voltage will likely blow the bulb.\n\n(2)\nHere you have two possibilities, depending on your circuit.\n(a) If you have a parallel circuit, then each light bulb will have 200v across it, and again the bulbs will likely blow because the voltage is to high.\n(b) If you have a series circuit, the voltage across the light bulbs will be subject to their resistance.  Assuming the resistance is the same, then the voltage will be the same, that is, 100v each.\nThe voltage across each light bulb will be equally proportional to it's resistance ratio.