Bio_Lecture_5

Bio_Lecture_5 - Readpages Lecture5:Energy...

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Lecture 5: Energy BioVisions Harvard Multimedia Energy Energy is a term we use a lot, but loosely o I don’t have much energy at 7:30 To a biologist, energy is: o The capacity to do work – the potential to cause change Forms of energy Energy comes in many forms: o Chemical: bonds o Electromagnetic: light o Concentration gradients: dam o Heat: random molecular motion Forms of energy: potential energy Potential energy: o Energy that has been captured and stored o Will be used in future Figure 6.1a: Girl on slide, energy stored in her position from climbing  up o In biology, seen as: Chemical bonds     Concentration gradients Forms of energy: kinetic energy Kinetic energy: o Energy of motion, energy being used Figure 6.1b: energy does work, causes motion or change o In biology, seen as: Heat (thermal) Light Mechanical First law of thermodynamics Lecture 5: Energy 1 Read pages
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1 st  law: Conservation Law Energy cannot be created or destroyed o Energy can be converted and change form In a closed system: o During an energy transaction, the amount of total energy does not change Second law of thermodynamics 2 nd  law: increasing entropy (disorder) over time o Can look at two pictures, figure out which came first o Bricks neatly stacked, bricks in a pile Entropy = energy that cannot do work (disorder)
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Bio_Lecture_5 - Readpages Lecture5:Energy...

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