![]() Bottom Dead Center (BDC): The piston is at its lowest point in the cylinder. Top Dead Center (TDC): The piston is at its highest point in the cylinder. The machine which does this job of energy conversion is called an Engine.ĥ External and Internal Combustion Engines But, the great step was taken in this direction when man leaned the art of energy conversion from one form to another form. ![]() Later, animals were trained to help and afterwards the wind and the running stream were harnessed. At one time, the primary source of power for the work of peace or war was chiefly man’s muscles. 2 Engines The distinctive feature of our civilization today, one that makes it different from all others, is the wide use of mechanical power.
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