How do you tell what switch is for which light bulb?  read on to see the rest of the riddle?
140337
-Turn on two of the switches\n-Leave them on for a minute or two\n-Turn ONE of them off\n-Go upstairs\n\nIf the light is ON, it's the switch that is on\nIf the light is OFF but WARM, it's the OTHER switch you had turned on\nIf the light is OFF and COLD then it's the switch you didn't use.
579320
Turn it off.\nA watt measures power, not energy. Power is the rate of using energy.\nEnergy is measured in joules.\nOne watt is one joule per second. \nA 100 watt light bulb uses 100 joules per second, or 6,000 joules per minute or 360,000 joules per hour.\n\nNow how much energy do you think it takes to turn on that bulb? An hour's usage? And how fast does it use it? All in the first second? If it really did used 3600,000 joules in the first 1 second, that would be 360,000 watts. That would definitely blow your circuit breaker. Does the bulb use one minute of power in the first second after you turn it on? If so, that would be 6,000 watts, which still blows your breaker. Most household circuit breakers trip at 15 to 30 amps, which is 1,800 or 3,600 watts on a 120 volt circuit.\n\nSo turn off the light.
827565
The voltage readings on the light bulbs are not what they definitely operate in, but optimim values. What is constant is their resistances, and connecting a larger voltage to a lower valued bulb will increase the current across it, and there is a possibility that this will burn the bulb.\n\nHowever, if you connect several bulbs in series to a higher voltage source, i.e. 3, 3, and 6, to a voltage source of 12 V, they should all be within the optimim values.\n\nGenerally speaking though, the bulbs in your example should still be ok (although they will shine much more brightly) unless you connect them in parrallel. (a volmeter across them would probably read about 4V and 8V if you connect them in series)
389372
It's impossible to say considering you give no indication of your lighting needs.\n\nThey do make fourescent bulbs which fit into regular incandescent sockets.  The flourescent bulbs use a lot less energy.
1137293
Zero. They won't do it. Engineers are too busy to change light bulbs and it's beneath them. Just one and he/she will tell you.
302293
the bulb has to be a DC bulb like a flashlight bulb.\n\nThe voltage rating has to match the battery. The bulb that lights in a two battery flashlight will not light on one battery.\n\nWire to complete the circuit.
1035019
you can unscrew a lightbulb
243184
Ane electric bulb, of course!
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 :)
482508
It is really a matter of which type of bulb you use.
43074
You can find the floor in a maximum of 14 attempts.\n\nDrop a bulb from the floors in this order:14, 27, 39, 50, 60, 69, 77, 84, 90, 95, 99, 100\n\nIf the bulb breaks, stop and test starting from just above the last floor that it didn't break on, and go up one floor at a time. If the bulb breaks on the first attempt, resume the test from the first floor.\n\nExamples:\n14 (breaks), 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13\n14, 27, 39 (breaks), 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38\n14, 27, 39, 50, 60, 69, 77, 84, 90, 95, 99 (breaks), 96, 97, 98\n14, 27, 39, 50, 60, 69, 77, 84, 90, 95, 99, 100 (breaks)
759091
------/:=====:x:=====:&#92;-----@-------\nL     2Wy                Int             2Wy           Load          N\n\n(Does this answer your question??)\n\nL=Live, 2Wy is a 2 way light switch, int is an intermediate switch, and @ is a light??\n\nConfused?? (never heard of tunnel switching!!?)
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!
1072750
turn on the first 2 switches  let them sit for a little while.  then turn on the 1st and 3rd switch.    go into the room right away, if the bulb is hot but off that means it was the 2nd one (because the switch is now off but it had to be on)  if the bulb is cold still (not really hot) it was the third one because the light just turned on and the 1st one didn't turn it on at all  if it is not on and the bulb is not hot at all it was the fourth because you never touched that switch  it was on and hot then it was the first because it was on long enough for the bulb to get hot.  \n\nso... when only the 1st and 3rd swith was on (after turning off 2)\n1=if it was on and hot\n2=if it was off and hot\n3=if it was on but cold\n4=if it was off and cold
502146
assume switches labeled 1, 2, and 3. turn switch 1 on for an extended period of time. turn switch 1 off. turn switch 2 on. go into the room. if the bulb is off and hot, it is switch 1. if it is on, it is switch 2. if it is off and cold, it is switch 3.
824158
You have to turn one light on for a while so that it'll warm up, turn it off and then turn another light on. then you can go into the room and feel the two unlit bulbs - whichever one is warm is the first one. The lit bulb is the second and the cold bulb is the third\n\n=)
264252
The 'apple' as you call it is actually a combination of two symbols. The | that represents power on and the O that represent power off. When joined to make the 'apple' it represent one switch to do both.\n\nI hope this helps.