ses100lec9

ses100lec9 - SES100 Ch. 13 Energy Power Srikanth Saripalli...

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1 SES100 Ch. 13 Energy Power Srikanth Saripalli
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Energy is what it takes to change the physical state of an “object”. In some cases, energy is released during such a change. Change of the physical state is called ‘work ’. What is energy?
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Examples: 0 mph 50 mph Energy Energy 1 ton 1 ton Energy 30ºF 78ºF 80 mph 65 mph Energy Exhaust gas Energy Gas, air (oxygen) Energy H 2 O H O 2
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Note: Energy’s unit is Joule. A mechanical system example: 2 1 2 Energy mv = The “work ” of changing the state of a mass of m kg from standing still to moving at a speed of v m/sec. requires:
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And… The work of lifting a mass of m kg by h meter requires where g = 9.807, the gravitational constant. Energy mgh =
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State Change (Work) Required Energy (J) Creation of the Universe 10 68 Starting earth moving in orbit 10 33 Hiroshima Atomic Bomb Explosion 10 14 (energy release) Pushing a 2006 Honda Accord from 0 to 60pmh 5*10 5 Hard-hit baseball 10 3 Lifting an apple by 1 meter 1 Hopping flea (per hop) 10 -7
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Energy Unit Equivalent 1 Btu (British Thermal Unit ) 1055 joules 1 calorie 4.184 joules 1 food Calorie 1000 calories 1 kwh (kilo-watt-hour) 3.6*10 6 joules Other Energy Units
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Where does energy come from and where does it go? Theoretically, the question ‘where does energy come from ?’ is the same question ‘where does the universe come from ? In a more practical term, energy is ‘stored’ in various forms around us.
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ses100lec9 - SES100 Ch. 13 Energy Power Srikanth Saripalli...

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