Teddy, ultimately ALL energy applied to an engine can be accounted for. If it doesn't come out as useful energy (e.g shaft horsepower), then it has to go someplace and usually it is rejected as heat. That's true with an electric motor (which gets hot), an internal combustion engine (which rejects energy through its cooling system) or a steam engine (which rejects energy by condensing steam to water).
The definition of efficiency is the USEFUL energy out of a system divided by the energy into the system. For an engine to have an efficiency greater than one, it must generate output power greater than input power, even after any losses due to rejected heat. And the laws of thermodynamics tell us that's not possible.
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Today's Featured Article - Buying your first tractor: Choosing the right one - by Chris Pratt. They cost less than the tax on a new tractor (at least where we live). They have the weight to do the job. They are simple and understandable. They even have a history and can be restored to become a major source of pride and enjoyment. But how do you know what to buy and how do you make the right purchase? There is a surprising number of machines available in every shape and size imaginable. Like most things in life, your needs have a lot to do with wh
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