The result would be, of course, a simple perpetual motion machine.

A perpetual motion machine of the first kind produces energy from nothing.

Perpetual motion machines only have one reservoir for the heat.

Perpetual motion machines of the second kind are thus impossible.

He spent his final years attempting to build a perpetual motion machine.

Now, this is the software engineering equivalent of a perpetual motion machine.

Today, the American tax system can be likened to a perpetual motion machine.

Same as thinking we can have a perpetual motion machine - pure fiction.

To think through if any perpetual motion machine will work, you need to pay attention to the energy requirements in every step of the cycle.

Nature has given us the perpetual motion machine we call wind.