05-Energynotes_(MS_Word_compatible) - Energy Energy Energy...

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Energy Energy Energy is a term we use a lot, but loosely To a biologist, energy is: the capacity to do work- the potential to cause change Forms of energy Energy comes in many forms chemical: bonds Electromagnetic: light concentration gradients: dam, membrane biology heat: random molecular motion Forms of energy: potential energy Potential Energy (energy of postion) energy that has been captured and stored (to be used at a later time) In biology, seen as: chemical bonds-- glycogen, triglycerides concentration gradient Figure 6.1a Forms of energy: kinetic energy Kinetic Energy energy of motion, energy being used In biology, seen as: Heat (thermal) Light Mechanical (movement) Figure 6.1b
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First law of thermodynamics- part of larger principle of conservation 1st Law: Conservation Law Energy cannot be created or destroyed energy can be converted and change form In a closed system during and energy transaction, the amount of total energy does not change Second law of thermodynamics 2nd Law: Increasing Entropy over time Entropy: energy that cannot do work (measure of disorder) No energy transaction (use) is 100% efficient cannot completely convert heat into work
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This note was uploaded on 04/11/2011 for the course BIO 111 taught by Professor Dr. bos during the Winter '10 term at Purdue.

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05-Energynotes_(MS_Word_compatible) - Energy Energy Energy...

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