BIO 121 Lecture Notes - Lecture 12: Photosynthesis, Cellular Respiration, Chemical Energy
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Bio 121 week 7 lecture 12 (cont. ) Energy is defined as the capacity to cause change or perform work. Kinetic energy: the energy of motion. An individual climbing up a ladder to a diving board. Potential energy: the stored energy of location or position. An individual standing on top of a diving board. The laws of thermodynamics govern energy conversions. First law of thermodynamics: the law of energy conservation, energy can"t be created or destroyed, can only be converted from one form to another. Second law of thermodynamics: all energy conversions increase the entropy of the universe. During any energy conversion, some energy is lost as heat. Heat is a form of kinetic energy produced during all energy conversions. While heat is not truly lost energy (energy cannot be destroyed), it is the most disordered form of energy: it"s difficult to harness heat for useful work. Order and stability decrease while entropy increases during any energy conversion.
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