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Why we don't use this in our houses to generate the electricity? Isn't the electricity generated by the magnets strong enough? Why do we have to pay for electricity if we can just create it by pushing the magnets attached to a rotor of the generator?

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  • $\begingroup$ Many people do use them most commonly as wind generators. Permanent magnet generators are just one type of option, there are various types of generators. $\endgroup$ – user6972 Mar 28 '14 at 19:48
  • $\begingroup$ there are very strong magnets that are able to hold a person if positioned well. Why not use this magnets to repel each other to achieve spinning the generator? $\endgroup$ – SamotnyPocitac Mar 28 '14 at 20:58
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You can't get 'free' energy, as energy cannot be created or destroyed. All 'free energy' devices are scams.

In order to generate electricity with a generator, you have to provide energy. If you turn the crank manually, that energy comes from your food, which comes from plants, who get their energy from the sun, which gets its energy from nuclear fusion.

If you are curious about how generators work, you can read about it here.

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  • $\begingroup$ well, the energy that I put into a generator is the energy coming from the magnetic field, magnets. And Yes, cannot be created or destroyed but it can be transformed... $\endgroup$ – SamotnyPocitac Mar 28 '14 at 20:56
  • $\begingroup$ there are very strong magnets that are able to hold a person if positioned well. Why not use this magnets to repel each other to achieve spinning the generator? $\endgroup$ – SamotnyPocitac Mar 28 '14 at 20:59
  • $\begingroup$ @SamotnyPocitac Gravity is capable of holding objects to the ground - why can't you generate energy with gravity? Because while a falling ball gains speed (kinetic) energy, that is due to the work gravity does on the ball. If you want to bring back the ball to its original position (before falling) you will have to perform work to get it there. It's just an exchange of potential energy. There's no 'free lunch'. $\endgroup$ – Kvothe Mar 28 '14 at 21:10
  • $\begingroup$ @SamotnyPocitac The magnets do no work, they simply redirect your work, just like a pulley. $\endgroup$ – Kvothe Mar 28 '14 at 21:12
  • $\begingroup$ but you do generate energy with gravity! What about the water power plants? $\endgroup$ – SamotnyPocitac Mar 31 '14 at 14:04
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And to expand on Kvothe's answer, the cost of the extra food you would need would exceed the cost of the regular fuel that you save. In addition, who wants to spend their life turning a generator?

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  • $\begingroup$ I wouldn't be so sure about that... smbc-comics.com/?id=2305 $\endgroup$ – Kvothe Mar 28 '14 at 21:14
  • $\begingroup$ Dang, how could I have forgotten superpowers? $\endgroup$ – Dr Chuck Mar 29 '14 at 10:11

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