How can I calculate the energy output from spinning a wheel at a certain RPM?

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To calculate the energy output from spinning a wheel at a certain RPM, the formula for rotational energy can be used, which is detailed on the provided Wikipedia page. This formula involves the moment of inertia and angular velocity. Additionally, for converting the calculated rotational energy into electrical energy, a conversion efficiency of 90% should be applied. Understanding these calculations allows for estimating the potential energy output effectively. Accurate calculations depend on specific parameters such as the wheel's mass and radius.
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How can I calculate the amount of energy I would get if I spun a wheel at a certain about of RPM? I know this is a general question, but I am looking for any kind of calculation I can use.
 
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Thanks, and what would be a rough conversion of this energy into electrical energy?
 

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