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Diesel fuel is burned in a cylinder, the fuel gives off it's heat to the products of combustion and the air used to burn the fuel. The fuel/gas mixture expands and pushes the piston/rod assembly to the bottom of the crankshaft, the next cylinder continues the process and so on... Each cylinder/ piston turns the crank allowing the first cylinder to rise while the exhaust valve opens expelling the exhaust gases out of the cylinder, the piston is then drawn down with the fuel valve open drawing in a new fuel/ air mix. Again it is compressed to about 9 to 10 atmospheres causing the diesel to ignite from the heat of compression, again propelling the piston/rod assembly downward. This process converts the chemical energy in the fuel into heat (thermal) energy which produces motive energy (aka external energy) in the expansion of the fuel/air mix. This expansion converts the heat energy partially into mechanical energy (the moving piston). The crankshaft then redirects the energy into a rotating shaft, (it is still mechanical energy). The rotating shaft then drives a rotating field inside a stator winding inducing an electric current in the stator windings converting the mechanical energy into electrical energy.

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