Energy Converted to Electricity A piston is ten feet in diameter and travels through a sleeve in one direction for a distance of exactly nine feet. The one-way trip travel time is six hours. It is then immediately pushed in the opposite direction for a return trip at the same distance and speed. In twenty-four hours the piston makes four trips. A constant force of 27,100 tons is exerted against the piston head at all times. No consideration is given to weight, temperature, lubrication, drag, energy required to run the piston or to run the mechanical linkage or to run the electrical generator itself. Additionally, and no consideration is to be given as to the rated efficiency of the generator or any other factors. However, it would be nice to have a list of the important factors that have been omitted. How much electricity will such a contraption manufacture within a 24 hour period? Except for the few parameters listed in the first paragraph, any assumptions can be made regarding "anything" that might make the computation [of electrical output] easier or more accurate. What is the approximate margin of error of such an estimate? 5%, 10%, 15%, 20%, 25%; or margin of error cannot be determined.