can electromagnetic waves generate an electric generator?
143587
Here is something that may or may not help\n\nIf you take a largish non polarized capacitor\n≥45µF\nand you apply AC 120V 60Hz to one side of it\nwith no ground reference! \nyou can then place \na small wattage low voltage lamp across the \ncapacitor terminals and it will light.\n\nThis is a way to send power over a single conductor.\nI have done this.\nI think it would also work with a coil instead of a cap.\n\nAs far as I can tell\nTesla wanted to use this principle to \npower the Earth\nusing the earth as the single conductor.\n\ndo you mean generate electric power at the other site?\ndo you mean energize an electric generator?\nmaybe for a very focussed wave and relatively small distance or a tiny amount of power.\nBut that is sort of why we use wires so much!\n\ndon't RFID cards transduce a wave and send it back\nI mean technically that is an example right?
240140
The tesla coil generates high voltage electricity at high frequencies.\n\nLots more details here...\nhttp://en.wikipedia.org/wiki/Tesla_coil
46766
DC generator would have a rectifier built in to convert the AC to DC.
698056
Generator is defined as (one of the following):\n- an apparatus that produces a vapor or gas \n- engine that converts mechanical energy into electrical energy by electromagnetic induction \n- someone who originates or causes or initiates something\n- an electronic device for producing a signal voltage \n\nTherefore the different types of generator are:\npeople, electronics, vapor producers (like combustion engines), and (electromechanical) devices used to transform mechanical energy into electrical energy.
1184412
Yes, in fact that has been done throught the concept of "Thermo-coupling" but again this method is economically infeasible, because the current generated in the process is in nano amperes.\nor in very small qty.
818946
OK, here they are verbally:\n\n"Maxwell's four equations express, respectively, how electric charges produce electric fields (Gauss' law), the experimental absence of magnetic monopoles, how currents and changing electric fields produce magnetic fields (the Ampere-Maxwell law), and how changing magnetic fields produce electric fields (Faraday's law of induction)." [See source.]\n\nGauss' Law--simply says electrons in motion will create a force field around the current.  This law follows the inverse square of the distance rule and the phenomenon is the basis for radio and TV broadcasting waves.\n\nThe monopole equation simply says that there must be both a north and south pole in magnetism.  (However, sometimes fictitious monopoles are used mathematically to solve some problems.)\n\nThe Ampere-Maxwell equation links changing electrical current to the creation of magnetic flux.  The Faraday equation links changing magnetic flux to the creation of electrical current.  This is the stuff that electric motors and electric generators are made of.\n\nThe Maxwell equations have a lot of practical applications.  Wave guides, such as for high powered radars, and coax cables, like for your TV, are designed using Maxwall equations.
70547
I think what you are really asking is what different forms of energy convert to other forms of energy.  Mechanical energy can be converted to heat through friction.  Electrical energy can be converted to sound energy with the use of varying electrical currents and permanent magnets.  The splitting of atoms releases huge amounts of electromagnetic radiation of a huge variety, from electrons, to photons, heat, light, etc.  Light energy (photons) can interact with semiconductors in solar cells to produce electrical energy, also known as electromotive force.  I am sure someone has a comprehensive list of the primary energies that we know about.  \n\nIt may help, however, to discuss energy in terms of storing it.  Gas under high pressure in a closed cylinder has high potential energy.  The release of this pressure can cause thrust (like a rocket), or cause a super-sonic shock wave that can blow things up.  Certain chemicals have energy stored in them which is released through chemical reactions.  A rotating wheel has energy stored in the mass about the rotating axis, known as rotational momentum.  The magnetic field in an inductor, like a vehicle ignition coil stores energy in the field in the core, and releases it when the current to the coil is interrupted.  \n\nIn simpler terms, mechanical energy can be turned into heat, light, electromotive force, or pressure. Chemical energy can make heat, light, electromotive force, or pressure (not a complete list).  Atomic reactions (fission or fusion) release huge amounts of energy all across the electromagnetic spectrum.  Hope this is food for thought...\n\nSee a study of thermodynamics and entropy.  It would appear that all energy flow is headed in only one direction, always at a net loss.  See the link.
623423
See this wikipedia entry.\n\nOne type of EMP is a gigantic electromagnetic pulse which is generated when an atomic bomb goes off a few miles above a city. It could induce electrical currents inside electronic equipment for 30 miles around, completely destroying them. It could wipe out all the high technology in a city, leaving people to live in the dark ages.
266037
You can create electricity using an ionizing chamber. The source has to be relatively strong to create a minimal ammount of electricity. One downfall of gamma radiation is that it can be reduced significantly by dense particles. it would be economically non feasible. It is currently being used to determine material density by measuring the voltage produced at the ionization chamber. The higher the voltage, the less density the material is. Usually in the 0-5 volts range depending on the source bequerel.
1139758
Yes, it could and we will harness this form of power in the future.\nHowever, please remember that lightning is used by nature as a means of providing food for the soil bacteria with nitrites and nitrates. Like anything else, if we become greedy and harness all the energy, we may create environmental problems, such as food production. This is in parallel with harnessing water in a river, and then holding up all the water to generate electricity and not let other creatures that depend on the water flow have that water.
1002785
Wireless electricity...Sounds kind of complicated.  If they wanted to do it, they could do it from satellites or something.  But it would have the same stipulations as WiFi, there would be areas that transfer the waves, and then there would be areas that don't, because they are out of limit.  Also, if you ever played SimCity, the Electric Satellites have a small tendency to miss, usually during the dry season in a wooded area...not a pretty site...
697343
Electromagnetic radiation is generally described as a self-propagating wave in space with electric and magnetic components. They are forms of radiation on the elctromagnet ic spectrum!! These components oscillate at right angles to each other and to the direction of propagation, and are in phase with each other. Electromagnetic radiation is classified into types according to the frequency of the wave: these types include, in order of increasing frequency, radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. In some technical contexts the entire range is referred to as just 'light'. [1]\n\nEM radiation carries energy and momentum, which may be imparted when it interacts with matter.\n\nElectromagnetic waves of much lower frequency than visible light were first predicted by Maxwell's equations and subsequently discovered by Heinrich Hertz. Maxwell derived a wave form of the electric and magnetic equations, revealing the wavelike nature of electric and magnetic fields and their symmetry. йō ŞрзĈ\n\nAccording to these equations, a time-varying electric field generates a magnetic field and vice versa. Therefore, as an oscillating electric field generates an oscillating magnetic field, the magnetic field in turn generates an oscillating electric field, and so on. These oscillating fields together form an electromagnetic wave.
341206
To harness the electricity usefully would be huge, but exceedingly difficult.\n\nYou could fly a kite with a wire string in a thunderstorm. \n\nDON"T TRY THIS UNLESS YOU FULLY UNDERSTAND WHAT HAPPENS WHEN 100,000,000 VOLTS DOES WHEN TRAVELING THROUGH ANYTHING IN ITS PATH!
140958
To answer your question first: Yes, it will generate a back EMF in the circuit each time the power to the electromagnet is turned off, but this energy is never equal to the energy which was originally applied when you turned the switch on.  Nothing in life is free :)  \n\nWhat you're describing is actually called a transformer. A transformer works by applying an alternating current (equivalent to turning your hypothetical switch on and off very quickly, many times per second) to one coil, which induces current in another coil (or several, depending on the design).  \n\nWhile a transformer can be relatively efficient, it can never be 100%, and certainly not MORE than 100%, as you describe.
303378
Hi,\n\nYou know that if electricity is apllied to a coil over a magnet it causes mechanical movement due to the formation of magnetic fields similarly the converse is also true\nthat if mechanical energy is applied to a similar but reverse arrangement electricity can be produced\n\n\nwhen current flows magnetic fields are induced but if a fluctuating magnetic field forms in a ciol electricity is induced
442259
No it is not possible at this time and I doubt anyone will ever attempt it for a couple of reasons.  From NASA's webpage you can read the rest by clicking on my sources link\n\n1. Most of the power in lightning is dissipated as thunder and light, which cannot be easily harnessed to generate electric power.\n2. However, even just the electrical current of lightning is considerable -- 20,000 amps on average, the same as 100 steel welders. But the power is on for only a brief fraction of a second, so the total power is actually small, only enough to power a 100-watt light bulb for six months.\n3. The huge surge of electrical current over very brief times makes storing the energy impractical.\n4. Lightning strikes to specific locations are infrequent and inconsistent. This makes scheduling power availability impractical.\n5. Lightning can be very damaging. The collection systems have to be incredibly robust, which would drive up costs. Lightning is also very dangerous, making it tough on the collection system workers.\n6. Lightning would have to be collected over a huge area, making the system impractically expensive.\n\n#3 Its saying that lightning comes with an extreme burst of energy in a very short amount of time.  When it comes to electricity it takes awhile to build up, electricity created by a damn for example is created by the water and the turbines, it builds up slowly and is put into its reserve where ppl then draw from it.  If there was to be a massive spike were the water all of a sudden speed up to even 100mph the turbines would overheat and become useless.  Imagine charging a battery, instead of putting it on a charger and gradually letting it build up you just zapped it with a tazer or something.  Its not going to charge its going to explode.  Therefore it is impractical to store it becuase we have nothing that could take such a massive amount of energy in such a short time
102674
Electromagnetism is the what allows information contained in electric circuits to actually leave the circuits. Althought he technique by which the information (electric signal) actually leaves the circuit is quite complicated, suffice it to say, that using an antenna, this information can be allowed to travel through air.\nCo-incidentally, even light happens to be an electromagntetic wave. So, you can say that human beings owe their vision to electromagnetism.\n\nMircowaves - an electromagnetic phenomenon allow you to exhange information with satellites, besides of course, allowing you to cook food.\n\nThink about it! Radio, Mobile phone communication etc. all owes its existence to electromagnetism.\n\nThis is course is with respect to electromagnetic wave phenomeona. When you actually think about the fact that one can create artificial magnetics using electric current, the possibilities are limitless