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Homepage U S. Energy Information Administration EIA However, it takes a lot more energy to produce those laser beams than is contained in the laser beams themselves. In fact, it takes between 300 and 400 megajoules to produce a 2.1 megajoule laser beam. If you’re really looking from cradle to grave, it’s 400 megajoules in, and 3.15 megajoules out, which is really pretty far from an energy-producing juggernaut. That doesn’t even take into account the fact that the targets themselves take a lot of time and energy and money to produce. This principle is vitally important to understanding the behavior of a quantity closely related to energy, called entropy. Entropy is a measure of evenness of a distribution of energy between parts of a system. Several formulations of mechanics have been developed using energy as a core concept. Thus, one joule is one watt-second, and 3600 joules equal one watt-hour. The CGS energy unit is the erg and the imperial and US customary unit is the foot pound.