What Is the Law That Says You Can Only Get Out What You Put In?

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The discussion revolves around the search for a law or theory that encapsulates the idea of "you can only get out what you put in," particularly in relation to motors and energy systems. Participants suggest the first law of thermodynamics, which emphasizes energy conservation, as a potential answer. They also mention conservation laws and continuity equations as relevant concepts. The conversation highlights the importance of understanding these principles in various applications. Overall, the inquiry seeks to identify foundational laws governing energy input and output.
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i am trying to find the law or therory that states "you can only get out what you put in?" and if there is such a thing as a one to one barrier? anything things that has to do with equal parts in creates equal parts out applyed to motors or anything really...
please help me find the name of the law or person with the therory.

thank you!
 
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The... first law of thermodynamics, perhaps?

- Warren
 
Conservation laws?
 
yeah conservation of energy
 

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