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What is the most efficient kinetic energy conversion?

Asked by timothykinney (2728 points ) January 28th, 2009

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%?

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