how is our brain powered by the sun?
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Most life on Earth is powered by the Sun. Plants use Photosynthesis to make carbohydrates from the Sun. Animals eat Plants, we eat both plants and animals that eat plants. Therefore indirectly virtually all of our food energy comes from the Sun. Our Brain uses our food energy to operate. Therefore our brain is powered by the Sun.
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Photosynthesis generally takes light, CO2 & water and makes sugars.  These sugars are chemically converted in to food, propane, methanol, ethanol, coal, oil, wood and all the other fossil fuels and orgnic compounds on the earth, through natural, geologic, and/or manmade processes.  At every step of each process, energy is lost.  To gain usable energy, other than in biologic processes, requires burning something, and using the expansion of heated gases to create physical force (motion), or then using physical force to drive a generator to create electrical current.    \n\nWe do not currently have an effecient method of making electicity using incoming Solar radiation.  Current solar cells convert a small percentage of one section of the electromagnetic spectrum into electric current.\n\nHope this helps.
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It's going to be difficult to tell you more than I know, but I'll give it my best shot.\n\nThe sun is big and bright and hot.  It is a giant fusion reactor creating energy by fusing atoms of matter together.  The energy is transmitted out into space as photons of light.\n\nIt is a medium sized yellow star which began making energy about 4 billion years ago and is estimated to have about 5 billion years left before its fuel begins to run out.
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The Sun is the only "substance" that can produce solar power!\n\nDid you perhaps mean what chemical substances can harness solar power?  Most solar cells are made from semi-conducting materials like Silicon and Germanium.  \n\nHere's some info:
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In the surface of the sun, the hydrogen and helium are get reacted and generate the heat energy. This power is a main reason to sun is very hot. Due to cenre of gravity all bodies get link with sun and rotate.
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As taken from the EERE Solar energy basics website:\n\n"Sunlight—solar energy—can be used to generate electricity, provide hot water, and to heat, cool, and light buildings.\n\nPhotovoltaic (solar cell) systems convert sunlight directly into electricity. A solar or PV cell consists of semiconducting material that absorbs the sunlight. The solar energy knocks electrons loose from their atoms, allowing the electrons to flow through the material to produce electricity. PV cells are typically combined into modules that hold about 40 cells. About 10 of these modules are mounted in PV arrays. PV arrays can be used to generate electricity for a single building or, in large numbers, for a power plant. A power plant can also use a concentrating solar power system, which uses the sun's heat to generate electricity. The sunlight is collected and focused with mirrors to create a high-intensity heat source. This heat source produces steam or mechanical power to run a generator that creates electricity."
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If the sun produced its energy by burning(like a wood fire, chemically changing atoms or molecules to other types of molecules by transferring or shifting pair bonds of small outer atom particles called electrons), the sun would indeed "burn up". In exothermic(producing heat) chemical reactions only these very light electrons give up energy. However, the sun produces its energy by the much more powerful & efficient nuclear fusion(nuclear bombs) process(hydrogen atoms are slammed together to form helium). In the sun 700 million TONS of hydrogen produces 695 million TONS of helium PER SECOND. The excess 5 million TONS PER SECOND of hydrogen-helium material is converted to pure radiant energy by Einstein's famous equation:\nE=MCsquared =M times C times C; \nwhere E= energy,\nM=mass,\nC =the speed of light=984million feet per second.\n\nAs you can see, energy is very very much when 5 million TONS OF MASS is multiplied by the speed of light(almost 1 billion feet per second), not just once, but TWICE. That is why a nuclear fusion bomb is millions of times more powerful than a chemical bomb. But the sun's energy per second isn't just one nuclear bomb...it is the very same energy as 10 BILLION NUCLEAR BOMBS PER SECOND. You may get an inkling of an idea how much power this is, if you imagine 1 square mile of terrain on the earth. In that square mile imagine 50 nuclear bombs blowing up...then one second later, 50 more nuclear bombs...then one second later, 50 more nuclear bombs...& on & on & on & on. However, that is just in one square mile on the earth. Now image that EVERY SQUARE MILE ALL OVER THE EARTH, FROM THE EQUATOR TO THE NORTH & SOUTH POLES ALSO HAVE 50 NUCLEAR BOMBS PER SECOND BLOWING UP. \n\nThat is the power of the sun.\n\nHowever, you say....fusing 700 million tons hydrogen per second must still burn the sun up in short order.\n\nBut the sun is huge...108 times the diameter & 300, 000 times the mass of the earth...for a grand total of 2200 million million million million tons of mostly hydrogen fuel. At its present rate, it would take 3.1 million million million seconds or 100 billion years to fuse its hydrogen. Towards the end of the sun's life, the sun will fuse quicker. But still the sun will fuse for 5 billion more years.
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For lower mass stars like the sun they are powered by a fusion sequence known as the proton-proton chain.\n\nThe main chain of it (there are actually three variations!) goes along the lines of:\n\nStep #1  Two hydrogen nuclei (protons) undergo fusion and beta decay to produce a positron, a neutrino, and a mass-2 isotope of hydrogen (deuterium).\n\nStep #2 The deuterium reacts with another hydrogen nuclei (a proton) to produce Helium-3 and a gamma-ray.\n\nStep #3 Two helium-3 isotopes produced in separate implementations of steps (1) and (2) fuse to form a Helium-4 nucleus plus two protons.\n\nThe net result of this is that 4H -> He + energy.  The gamma rays and the resulting matter-antimatter anihilation of the positron all produce energy to drive the sun's luminosity.\n\nFor simlicity's sake I've excluded the neutrinos, as they only matter to the energy budget when you look at the reaction in extra fine detail.
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The sun is not the source of ALL the energy - just almost all of it.  \n\nLight is a form of energy, most of our light is from the sun but we do recieve a tiny fraction of light from the other stars in the sky - that is why we can see them.\n\nBut the sun does supply almost all the energy.\nThe sun radiates light and other forms of energy which hits the earth and some is absorbed (some is also reflected).  Much of the absorbed light becomes heat - this is why it is hotter in the sunshine than the shade.\nSunlight also allows plants to obtain energy by a process called photosynthasis which happens in leaves and green stalks (like on a cactus).  It is this energy from sunlight which allows plants to grow.  All living things use this energy from plants via the food chain.\nFuels (like coal and oil) come from the remains of plants and animals and thus the energy was originally from the sun.\n\nThere are sources of energy which don't come from the sun such as geothermal power (this is heat from the centre of the earth which is created by pressure) and there are even organisms which live deep in the ocean which do not need any sunlight to survive (they are chemotrophic bacteria which survive around active volcanic vents in the sea floor).  \nBut to all intents and purposes a good 99% of all the energy comes from the sun.\n\nI hope this helps you with your homework!
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http://en.wikipedia.org/wiki/Sun
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There are many ways to take advantage of the energy produced by the sun.  A good place to start is with a passive solar energy water heater.  They are inexpensive to install and easy to maintain.  The simplest ones use the radiant energy of the sun and convert that to thermal energy using a material that absorbs the light instead of reflecting it, in layman's terms, something black.  \n\nPhotovoltaic (solar cell) systems convert sunlight directly into electricity. A solar or Photovoltaic cell consists of semiconducting material that absorbs the sunlight. The solar energy knocks electrons loose from their atoms in a semiconductor, allowing the electrons to flow through the material to produce electricity.\n\nFor a more in-depth explanation of photovoltaic technology try this site.
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the sun doest not use oxygen. it actually follows a method called nuclear fusion, whereby two hydrogen atoms react to form a helium atom. with this, very large amounts of heat and light are produced
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Actually the myth was we only used 10 Percent of our brain......\n\nThis has been proven false.  The reason it too lengthy to put here.  Hopefully the link below will be helpful to you.\n\n:)\nPeace
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Like the  filament in a light bulb, stars don't produce the energy themselves.  A massive electric current flowing through space passes through the Sun, heating it up and creating light.  The evidence for this energy is all over the place, but a few things with the Sun that tip us off are:\n\n1. Missing neutrinos \n2. Temperature of the halo-like corona is 300 times that of surface \n3. Rotates faster at equator, faster on surface \n4. Solar wind accelerates upon leaving the Sun \n5. Sunspots reveal cooler interior \n6. Sunspots travel faster than surrounding surface \n7. Sunspot penumbra (interior walls) reveal structured filaments\n\nThere are a lot of other examples among the planets that show us that our solar system is electrified.  The movement of the planets are caused by these massive electric currents coming from the Sun, spinning in the magnetic field created by these electric currents.  The astronomers nowadays always like to talk about magnetic fields, always ignoring the fact that where there are magnetic fields there are electric currents.\n\nhttp://i43.photobucket.com/albums/e397/Bigpappadiaz/magcur.gif\n\nDo some research on the Electric Universe, because the future of astronomy and astrophysics is plasma cosmology.
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in Solar Battery!!\n\nmuahahahahahahaha
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It absorbs light energy from the sun.
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Energy in the form of photons is generated in the sun's core. Photons like to take off at the speed of light, so they do. But they move only 1micron before running into(being absorbed by) a gas molecule. That's because the gas atoms at the center of the sun has a pressure of 250 billion times the earth atmosphere's sea level pressure. That is why gas atoms are so hard for photons to miss. But the gas atom gets so excited with the extra energy it carries from that hot photon that it lets go of another photon, that promptly runs into another gas atom. This emitting & absorption occurs 100 million trillion times PER YEAR.  You'd think all this elbowing going on that it would get to the sun's surface fairly quickly. But this radiative process takes from 30,000 to 200,000 years to make it only about 55% of the way to the sun's surface. But once it makes it to this higher convective layer of the sun(like the earth atmosphere's lower convective atmosphere), then the energy is transported fairly quickly to the sun's surface.