Why does lighting come from the ground??
439180
Lightning is an electrical connection between the ground and the sky, it can come from the ground or from the sky or from both at the same time and meet somewhere in between.
751197
.......because electricity looks for the closest path to the earth........and you standing on the ground, combined with the fact that humans conduct electricity - means that you're its route to the earth!
905280
Light 'dimming' is due to a decrease in the intensity of the light that reaches your eyes. This is different from the waves loosing energy or becoming 'shorter.'\n\nThink of it this way... When you shoot a shotgun, the pellets are very dense, grouped closely together, when the exit the barrel. As they get farther away from the barrel, they get farther away from each other. This is kind of what happens with a decrease in intensity.\n\nHere's another way, one that is more applicable to your question. Think of the surface of a star. It is, roughly, a sphere. To make this simpler, lets just think of the star as a circle. (It may help to draw this out as I'm explaining it) Let's assume that all of the light that is emitted comes straight out of the surface. A way to picture this is to draw straight lines from the center of the circle outwards. Do this for a few lines that start out very close together and are almost going in the same direction. Extend these lines out very far from the center. Do you see how, as they get farther from the center, they get farther away from each other?\n\nYou can also draw a tiny dot some distance away from the circle. This can represent the earth. How many lines that initially start out close together actually intersect this dot? Now can you see why the light gets dimmer? It is because only a small fraction of the light that is sent in our direction actually reaches us.\n\nWhile it is true that light waves do extend forever, they do not exist everywhere. To describe where something is located, you can only talk about how probable it is to be located somewhere. This is a consequence of the Uncertainty Principle.\n\nIf you want to know more, I suggest looking at wikipedia or googling Schroedinger's Equation. There are probably other people who can explain it far better than I could.
733617
it is due to the rotaion of the Earth with respect to Sun , \n\nit is visible from east first  not rising , \n\nthe light rays emerges form east.
55361
In flourescent lights electricity passes through a gas (i.e Neon)to create the light. This is much more efficient as very little heat is produced. Unlike incadescent ones,which create a lot of heat.
862074
If I understand you question correctly, you are putting in a retrofit fluourescent bulb into a standard lamp with a 3 setting light switch.\n\nYou are probably using power on setting #1, but there is not enough power to have the ballast convert the voltage and ignite the gas in the bulb.  But it is probably using energy constantly trying to light the bulb.  \n\nIt is a different principle than an incandescent bulb where no light = no heat = no power.\n\nI am not a total expert on the retrofit bulbs, but I would say if it is humming and the base above the socket warms up, it is using power.
571899
Lightening always takes the quickest path to ground. Water is conductive so if water is the closest conductive thing to ground from the point of origination then it well conduct electricity down to ground.
41488
I would guess that we use a car,because we all know what they are. We also know that cars have headlamps located on the front. We further know that the light is projected so as to illuminate the area in front of the car. What we DON'T know, is how to get one of them to move at C...No, not even your best chevvy.
652748
It could be a form of migraine starting.  The best thing would be to check with a doctor.  For some people, certain types of lighting brings on a migraine.
165109
You are seeing the effect of pressure on the rods of your eye, which are fooled into thinking they see light. It should appear on the opposite side from which you press. It's called "phosphene".
341077
I believe they are refering to sheet lightning that never touches the ground. In the tropics it can be extremely brilliant lighting up the sky like a neon glow.
318560
For this we have to check the basics of Lightning or a spark. \nLightning is caused due to the difference of static charge between two layers of energy. Our eco-system is composed of layaers of energy always in motion. Air breaks down at 10,000 volts per inch, considering the humidity in the atmosphere. When the charge on the clouds, produced due to friction, exceeds the sparking voltage, a lightning is produced. When a spark is produced, it is like a mad blind dog, searching the easiest path fast. The spark may be caused between two clouds, between the cloud and the Earth, or the cloud or any object in the space. Most of the lightnings are lost in space as the volts per inch for a spark decreases with pressure, being the minimum for free space(Vacuum). Some are also lost amongst the clouds.\nNow let us see what happens to a spark between a cloud and the earth. It is a must for a spark to terminate at the ground, the earth being neutral and a huge resource of electrons. Nothing else has the capacity to provide such magnitude of electrons. Now, in its path, the spark tries to travel the path with least resistance. It is also worth noting that a spark is also associated with production of heat.\nEven though wood is a bad conductor, live green trees with water contents, and rising high in the air were good target for the lightnings. They would burn it and split it while passing through. Now it has better baits - the towers and high rising buildings. A high rise produces a area of lightning shadow around its base. The higher the building, the bigger the area. All the lightnings for that area is absorbed by that building. It is likely that the building will have lightning catchers, which passes them directly to the Earth without letting it do much damage.\nIn cities, it is almost impossible of being thunderstruck.\n\nLet us check the case of rural areas.\nThe danger is when a lightning is produced in wide open space. It has a peculiar tendency to bend. Sometimes, it is amazingly seen to run parallel to the ground. This is caused due to a dry crust or upper coating of the Earth. It acts as an insulator. The lightning bends and tries to find the nearest path to enter the Earth. This might cause hazards. People working in fields; sometimes animals are killed. So, here is the maximum chance of being thunderstruck.\nThe damages caused by a spark varies with the amount of charge still present and the heat already produced. A spark continuously loses its charge content into the surrounding system. Also, it continuously gets warmer as it travels, depending on the system temperature. When, a spark(charge) passes through you, the electrons tend to disrupt your nervous system traffic and the heat burns your tissue. For household voltages, which is 110 volts in countries like USA and 230 volts in countries like India, we feel jolts and cramps in our muscles, which either results in instantaneous withdrawal of the contact part or inability in doing so. The later is surely serious. Now you can compare the effects of a lightning. You will be lucky if the lightning loses most of its charge.\n\nBEST OF YOUR LUCK!
74378
sounds like there is a faulty ground somewhere in the system.  have there been any recent lightning strikes (could cause an intermittent short).  Also, be sure to verify that you have a good earth ground inside your house.
72663
Its a cute question. :-)\nLet me explain it this way.\n\nShadows arent necessarily objects themselves. \nThey are just a patch of surface, which dont recieve direct light from the source (sun, lamp etc), but only recieve the scattered rays of light. \nAnd for this reason, these patches are dimly lit, making it look darker than the surrounding, which in our daily terms is 'black'. :-)
472973
Lighting can travel ground to cloud, cloud to ground or cloud to cloud
360366
It's all about contrast.  If you are in dark room, with a single bright light shining, your shadow will seem quite dark.  Shadows are simply caused by blocking light from a source, so if there are additional light sources the shadow will seem lighter.
248658
static grounding I believe