lecture23 - Lecture 23 limits on efficiency calculate...

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Lecture 23 limits on efFciency, calculate efFciency of Carnot cycle Electricity: chapters 25-31
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Proof by Contradiction : I want to prove statement “A” is not true assume A is true, Fnd a violation of basic law assumption is in correct, A is not true no perfect heat engine (from lecture 21): η = W out Q H < 1 ( η = W out Q H > ± 1 from energy conservation)
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Proof by Contradiction: II allowed or is there an ? no heat engine more efFcient than perfectly reversible engine Next: develop perfectly reversible engine (Carnot cycle), calculate efFciency ( ) η =0 . 99 η max (for given T H,C ) η max
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Electricity (chapters 25-31) going beyond Newton’s laws charges at rest and in motion (currents): less experience, e.g., don’t see movement of charges electricity and magnetism connected (PHY 270) new concept of “Feld” to describe interactions (macroscopic description) microscopic level: relation of charges to atoms/molecules; atoms (neutral) made of charged particles (electrons and protons): can
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lecture23 - Lecture 23 limits on efficiency calculate...

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