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Thread: Production of energy today

  1. #1 Production of energy today 
    Forum Freshman
    Join Date
    Feb 2009
    So this is my first post on this forum.I am going to high school i love physics but i ams still on a low level.
    But this what i got.
    We produce energy by moving a magnet with a dynamo and make it spin around a magnet (a thing with coper line spined,which i forgot how its called)We use the coal(or something like that) to power the dynamo. So i was wondering .why dont we add a second magnet that powers the dynamo.that way the thing wil powering the city and the machine will power it self.But another thing is i think the these 2 magnets will interact with ea other and blow the thing .Is there any kind of way to isolate the 2 spiral thingys so the magnet will go both of them.?

    I am from greece so my spelling may be bit off

    Regards :P

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  3. #2  
    Forum Radioactive Isotope MagiMaster's Avatar
    Join Date
    Jul 2006
    As soon as you say "the machine will power itself" you should stop and really think over the details carefully. Of course, you may not have meant it in that way, but if not, I'm not sure what you mean.

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  4. #3  
    Forum Masters Degree Numsgil's Avatar
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    Jan 2009
    If a machine could power itself, it would violate the second law of thermodynamics. If it could power itself and a small city, it would violate the first law of thermodynamics.

    So essentially it's physically impossible.
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  5. #4  
    Join Date
    Apr 2007
    If you put a second generator coupled to the turbine in tandem, the induced current in the stator of the added generator would itself induce a magnetic field in opposition to the motion of the rotor. This means you would have to burn more fuel and make more steam to turn the turbine at the same speed.

    If you have one of those permanent magnet generators that rub against the wheel of your bicycle to light the headlamp, try spinning it with your fingers. It doesn't spin freely; you have to do some work.
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