What's the best way to put kinetic energy in batteries?
I had the idea to have the kids at my favorite summer camp group to "pump" their own electricity because one of the more primitive camps in that group already pumps their own water, but doesn't use electricity.
What's the best way to put kinetic energy in batteries? When i say best i mean highest mechanical advantage.
The ways i can think of are:
-shaking a magnet through a coil of wires
-spinning a wheel to shake " "
-pedaling to spin the wheel to " ''
-using a lawn mower sort of wheel.
Also to refresh my memory what are the other ways (with a higher mechanical advantage) to move a magnet with coils to generate electricity?