Is a 100% Efficient Machine Considered a Perpetual Motion Machine?

[YashaTheBest]

Can perpetual motion machine not produce extra energy just be 100% efficient and still be considered a perpetual motion machine?

I understand the laws of thermodynamics states that a machine cannot make more energy than it uses. But theoretically if you remove all the losses and have a 100% efficient machine could I call it a PMM or it has to produce more energy to be called a PMM.

This question is purely whether or not can I call it a PMM.

 

[phinds]

A PMM (which does not exist) does work. Your hypothetical machine (which ALSO does not exist --- there's no such thing as zero load) does no work so it is not a PMM

 

[YashaTheBest]

A PMM (which does not exist) does work. Your hypothetical machine (which ALSO does not exist --- there's no such thing as zero load) does no work so it is not a PMM

This doesn't answers my question.

I know that It doesn't exist and I'm not claiming anything. I do not need people saying "it is impossible" or "does not exist" or "there is no such things". I simply want to know whether or not can I call 100% efficient machine a PMM.

 

[phinds]

Since there isn't any such thing, I'm not at all clear that it MATTERS what you call it.

As I specifically said in my post, a PMM does work and yours doesn't so yours isn't a PMM. Was that not clear?

 

[Dale]

I think that, by definition, a PMM has to output more work than is input. So a machine that just breaks even is not a PMM.

 

[russ_watters]

See the wiki for pmm: it defines several types.