Mechanical energy extracted by the engine is from pressure due to expanding gasses. Delta P Gasses that are already hot and placed into the engine do not expand. In fact they would contract. The pressure increase Delta P in the engine that does work is when you take cold air and heat it. Work is change. Making hot Delta T pressurized air delta P from cold air at atmospheric pressure requires energy. When that hot pressurized air becomes cooler/lower pressure air. It's giving off energy. The losses in conversion is why 60-70% of the heat in the fuel is lost as heat in a typical engine. Really large combined cycle gas turbines, reciprocating engines and steam boilers. Are really stretching to achieve 50% efficiency.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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