That's because the system--your body--wasn't made for that.
[Even if thinking up the right way to explain it is difficult, it's a nice distraction from feeling horrible.]
Like, if your running, usually the energy in your body is just used to make you go forward, since that's the system in place. But if we put you on a wheel, the energy makes the wheel turn, instead. If that wheel were then attached to a magnet, making it turn--and if the rest of the electricity machine were built there, too--then the energy in your body could be used to make a light go on. I would think, anyway...
no subject
[Even if thinking up the right way to explain it is difficult, it's a nice distraction from feeling horrible.]
Like, if your running, usually the energy in your body is just used to make you go forward, since that's the system in place. But if we put you on a wheel, the energy makes the wheel turn, instead. If that wheel were then attached to a magnet, making it turn--and if the rest of the electricity machine were built there, too--then the energy in your body could be used to make a light go on. I would think, anyway...