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/sci/ - Science & Math

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4641134 No.4641134 [Reply] [Original]

In an electric generator. Which would yield a higher energy output. A greater mass turned; or a smaller mass turned faster? givin they are within means of eachother as far as comparison. ex.) {100Kg:2rpm} {2Kg:100rpm}

>> No.4641140

or would they yield the same?

>> No.4641152

>>4641140
What do you think a generator is doing?

It converts from one energy form (physical) into another (electrical). It has an efficiency parameter between 0 and 1, probably 0.75.

Depending on the design, you could make either of those; I'm not sure which has a simpler time, but I bet it's easier/cheaper to make the big slow one efficient than it is to make the little fast one efficient.

>> No.4641467

Rotational Kinetic Energy = 1/2 I w^2 w being the rotational velocity and I being the rotational momentum. for something like a spinning rod I = ml^2/12 . so Energy is proportional to w (the speed of rotation) squared while it is directly proportional to only m. Conclusion: m matters, but w matters squared.