What is the most efficient kinetic energy conversion?
I am curious what the most efficiency way to convert kinetic energy into electrical energy is (known to man). This means not using heat (cogeneration) or potential energy (hydroelectric). But just turning motion into electricity (faraday effect, brakes on a Prius, etc.).
Can someone point to a source that gives a percentage conversion higher than 75%?
This question is in the General Section. Responses must be helpful and on-topic.