How does the law of conservation of energy apply to machines?

-machines create energy from scratch.
-machines consume energy until no energy remains.
-energy transferred to a machine equals energy transferred from it.
-engineers break the law of conservation of energy by using machines.

Energy can be changed from one form to another, but it cannot be created or destroyed. ... This principle is referred to as the first law of thermodynamics or the law of energy conservation. The law applies to all systems both large and small, and, again, it states that energy cannot be created or destroyed.