It’s fascinating to watch a good old-fashioned spinning wheel emerge as the battery of the future
http://itotd.com/articles/332/flywheel-batteries/
A flywheel is simply a heavy spinning wheel that stores kinetic energy and then releases it as needed.
Now people are turning flywheels into batteries. Conceptually, a flywheel battery is very simple. Hook up a motor to a flywheel to spin it when electricity is supplied (storing the energy as kinetic energy). When you want to retrieve energy from the flywheel, hook it up to a generator. (In fact, the motor and the generator can be one and the same.) So you put electricity in and get electricity out, and in the meantime it’s “stored” as the motion of a spinning wheel.
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