RS 301 - Energy Lecture Notes - RS 301 Professor Wolf Cal...

RS 301
Professor Wolf
Cal Poly Pomona
Fall 2009
Lecture Notes on Energy
ENERGY
[wolf 2]
industrial system
guarantee on time, atrt and works
pay price for it external price
energy amount is finite
energy is stored in some form and we are always transforming it into another form
sunlight:constant energy source
big driver for every energy is sunlight except 4 nuclear
sunlight lifts water to dam
sunlight is heat, plant produce fuel
so when look at ways people do energy
storage:
hydro electric – pot enrgy
wind wind in fast comes out slower and diff between kin energy air coming in extract
propeller in stream – kin tidal energy
burn fuel
nuclear
take air release pot energy
these arfe intermittent source – means sporatic – fos fuel not intermittent
problem with renewable enrgy is that it is not dense – like oil and nat gas
video “shldnt burn oil its too valuable”
conservation of energy – which means u don’t get anything for free – amount of worl exact same as work out
– cant get any more out than put in – natural inefficiencies built into the system
potentioal is ability to do work that is stored in position for relation between things – like spring or
magnet – rubber band elastic energy- do work to pull apart – put work into system and then get back
out again – stroe in postyion or relation – compressed air let out turn fan
nuclear energy-string force-hit pos charge fly apart get energy –
thermal energy is just heat – not particularly useful
so have electrical potential in form of battery
kinetic energy is – stored in motion of bus =force for a distance over time

basically fos fuel is = if u take a pos charge and a neg charge, they want to be together, co if u take
them nd u separate them, in order to sep them u have to apply force for a distance u have to do work
and when u let them get closer together u can get that energy out again - basically what fos fuel is
so once apon a time co2 in water – can think of as charges close together – plant took sunlight and
suger and ox is photosynthese – sugar molecues = cellulos can think of sugar as pos nad neg charges
apart – cont….
but cant see – called pot energy – banking analogy
pot energy not measurable so come up with account tool called pot enrgy which is a way of keeping
trak of where the energy is–
way this works in real life is u have a dam here, that has water and then u have a lake here with water