>>Hi,
>>
>>>Sounds good. I suppose though you have to brake a lot to build up potential, thus needing to replace the brakes more often, with the power it requires to make new brakes. Ain't no such thing as a free lunch :-)
>>
>>I think the opposite is true. You use the brakes less because the 'dynamo' itself acts as a brake. Same as riding a bycyle down hill with a dynamo - the dynamo slows you down.
>
>Sort of like engine breaking when you select a lower gear?

Sort of, but the analogy doesn't get you too far, because no matter what you do, internal combustion engine won't produce gasoline. Electric motor can act as a generator, which is the point here.