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E Lecture

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by

Andrew Lammers

on 23 April 2012

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Transcript of E Lecture

E
nergy Lecture

Energy
is the ability to do work!

(and work is a force applied over a distance)
Types of
E
nergy

Mechanical
E
(KE + PE) = Mechanical
E
nergy
examples?
Thermal
E
(
E
from the motion of particles)

Plasma
Gas
Liquid
Solid
Chemical
E
(
E
from breaking chemical bonds or
E
stored by making new bonds)
Electromagnetic
E

E
nergy travels in waves (but not like ocean waves)
across the universe
Electrical
E
(electric charges in motion are KE, stored charges are PE)
Nuclear
E

nuclei splitting up (fission)or
hooking up (fusion)
either way mass -->
E
nergy!!!
PE: Position & shape
[Note: GPE = w*h]
E
Conversions...
now it gets interesting

Swamps --> Instagram
2 Laws of
Thermodynamics...
now it gets R
E
ALLY interesting!

1st Law - energy is an adolescent
2nd Law - conversions are HOT
Sunlight + CO2 + H2O = Glucose + O2
Glucose + Oxygen = CO2 + H2O +
ATP
Methane + Oxygen = Heat + CO2 + H2O
The
E
lectromagnetic Spectrum:
lots of "types of light"
2009 U.S. Energy Use
http://www.dailymotion.com/video/x7mj8z_the-simpsons-nuclear-energy-film_shortfilms
Kinetic Energy
Potential Energy
Photosynthesis
"I have not failed, I've just found 10,000 ways that won't work." - Thomas Edison
Fusion
2012 U.S. Energy Use
Fission
photo by Zen Sutherland 10/28/07
Energy
No more
E
left!
Global Energy Use
http://www.bit.ly/eG9Xcz
E
Units = Joules (J)...a push of 1 Newton over 1 meter
E
lectrical Power Unit = Watt (W)...using one joule of energy in one second
"Now I have become death, the destroyer of worlds." -Robert Oppenheimer from the Bhagavad Gita
http://www.atomicarchive.com/Movies/Movie4.shtml
http://www.atomicarchive.com/Movies/Movie5.shtml
Lots of thermal energy!!
Only a little bit of thermal energy.

Note: No thermal energy exists at 'absolute zero' (-273 C).
Lake Julian Power Plant...Thermal
E
in use!
Yummy!
Respiration
Our world at night.
E
for the information age.
http://www.pbs.org/wgbh/nova/einstein/media/nova-expe-tyson.mp3
An Electromagnetic House!
http://www.pbs.org/wgbh/nova/physics/states-of-matter.html
KE: velocity and mass, but
velocity > mass
E
nergy cannot be created or destroyed. It is conserved!

Some
E
nergy is "lost" as heat every time energy changes form.

2050 U.S. Energy Use
The Rise
Fracking!
Full transcript