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ES101 Lecture Notes - Lecture 12: Incandescent Light Bulb, Electric Light, Thermodynamics

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School
WLU
Department
Environmental Studies
Course
ES101
Professor
Doctor Edmund Okoree

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Document Summary

The first law of thermodynamics or the law of conservation of energy states that: In all physical and chemical changes, energy is neither created nor destroyed, but it may be converted from one form to another: you cannot get more energy out of a system than what you put into it. Second law of thermodynamics: when energy is changed from one form to another, some of the useful energy is always degraded to lower quality, more dispersed, and less useful energy. What happens to the energy that is degraded: the energy takes the form of heat. Only 20-25% of chemical energy of gasoline is converted into mechanical energy that moves your car along the highway. What happens to the other energy: the energy is converted to low-quality heat that is released into the environment and eventually lost into space. The electrical energy flow in a traditional incandescent lightbulb is converted to only 5% useful light.

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Related Questions

......Use the following to feel out the sentense: cycled, photosynthesis, cellular respiration, oxygen, carbon dioxide, ATP

During ____________ , mitochondria break down carbohydrates to produce energy that is used to make ____________ .

This process requires ____________ and carbohydrates, and produces ____________ and water.

During ____________ , chloroplasts use water and ____________ to create carbohydrates.

This process requires ____________ and water, which are byproducts from ____________ .

In turn, it produces ____________ and carbohydrates that are used in ____________ .

In this manner, the flow of energy is ____________ between chloroplasts and mitochondria.

..........use the following to feel out each sentense: from, oxidized, photosynthesis, cellular respiration, gains, to, loses, reduced.

During ____________ , hydrogen atoms are transferred ____________ water ____________ carbon dioxide as glucose forms.

Thus, during ____________ , carbon dioxide is ____________ , while water is ____________ . In other words, carbon dioxide ____________ electrons and water ____________ electrons.

During ____________ , glucose is ____________ as oxygen is ____________ , becoming water.

In each of these reactions, while one molecule loses electrons (is ____________ ), another gains electrons (is ____________ ); thus, each of these metabolic pathways includes redox reactions: coupled reduction and oxidation reactions.

..........use the following to feel out the sentenses: increase, conservation of energy, first of thermodynamics, input, decrease, laws of thermodynamics, secod law of thermodynamics, heat

The ____________ explain energy flow and energy conservation and can be applied to biological systems.

The ____________ states that energy cannot be created or destroyed, also known as the law of ____________ .

The ____________ states that energy is lost when it is converted from one form to another, often in the form of ____________ .

As cells go through transformations, they ____________ the total entropy of the universe, resulting in a ____________ in available energy.

For example, photosynthesis in plants requires an energy ____________ to turn carbon dioxide and water into sugar because there is a ____________ in entropy.

As entropy increases there will be more useful energy to do‘work’. True or false?

False. As entropy increases, there will generally be less usefulenergy to do work. We can think of entropy as usually being presentin the form of heat energy. Imagine a car motor, which attempts toturn chemical potential energy into kinetic energy (movement). Lessefficient motors will get hotter for the same amount of fuelconsumed. When you drive a car you hope that most of the fuelenergy is converted into kinetic energy and not lost as heat(entropy). The hotter the car (and thus the more entropy) the lessefficient the ability to do ‘work’ (the moving of the vehicle).
True. As entropy increases, there will generally be more usefulenergy to do work. We can think of entropy as usually being presentin the form of heat energy. In most biological and mechanicalsystems it is heat energy which is captured to do useful 'work'.Heat energy, the random movement of molecules, and increases inentropy are central to doing useful work.

Biological systems sometimes appear on the surface to break theSecond Law of Thermodynamics – by seemingly increasing the order inthe overall system. They don’t. Why?

a. Earth (and living things on it) are not a closed system. Thesun's constant input of energy in the form of photons is harnessedby living things to create internal order within themselves. Butwithout such a constant input of energy, most biological systems onearth would break down.
b. The Second Law tells us that no natural process can occurunless it is also associated with an increase in the entropy of theuniverse. A living organism (such as an animal or plant) brings inmatter and energy from its environment and uses this to creategreater order within its body: the processes of life. But it isimportant to keep in mind that all animals and plants are also partof a larger system of the environment around them. While creating asmall ‘pocket’ of order, the processes of life (metabolism,movement, etc..) releases heat into the environment – thusincreasing the entropy of the universe and following the2nd law.
c. Living things, by harnessing energy to create order (withinand around themselves) actually create a paradox in questionssurrounding the first and second laws of thermodynamics andseemingly violate many previously held assumptions.
d. Both a and b above are correct.

When plants capture energy in the photons of sunlight andconvert that energy into the chemical bonds of organic molecules,are they creating new energy?

No, the energy is being transferred from one form into another.But no new energy is being created.
No, the overall total energy is decreasing over time.
Yes, by capturing photons, the plants are creating newenergy.
Yes, by capturing photons, the plants are creating new energy -of a different wavelength.

In each of A-C, below, indicate whether: a) the statement is possible under the laws of thermodynamics; b) the statement violates the First Law; c) the statement violates the Second Law. In the case of a Second Law violation, circle the name of the scientist whose version of the second law is most simply and obviously broken. In each case there is a best name, but feel free to explain your choice. (Adapted from Bill Reinhardt.)

A. A novel and reversible heat engine absorbs 10 kJ of energy from a high temperature bath, performs 8 kJ of work on the surroundings, and exhausts 5 kJ of heat into a low temperature heat bath.

a. possible

b. violates First Law

c. violates Second Law: Kelvin Clausius Boltzmann

B. One night you wake up to discover that all the air in your room has gone under your bed. Note that this happens with no change in energy or temperature.

a. possible

b. violates First Law

c. violates Second Law: Kelvin Clausius Boltzmann

C. A novel & reversible heat engine absorbs 10 kJ of energy from a low temperature reservoir, performs 8 kJ of work on the surroundings, and exhausts 2 kJ of energy into a high temperature bath.

a. possible

b. violates First Law

c. violates Second Law: Kelvin Clausius Boltzmann