Transcript ENERGY - Regional School District 17

ENERGY
Energy Forms, Conversion, Resources
and Conservation
ENERGY - the ability to do work
Energy is known by the changes it causes
WORK - when a force moves an
object through a distance
Transfer of energy
Measured in Joules
TYPES OF ENERGY
Kinetic Energy - energy of motion
– Depends on an objects MASS and SPEED
TYPES OF ENERGY
Potential Energy - stored energy due to
position or shape
– Depends on an objects MASS and
POSITION
TYPES OF
POTENTIAL ENERGY
Gravitational Potential Energy – energy that
depends on HEIGHT, MASS & ACCELERATION
due to gravity
TYPES OF
POTENTIAL ENERGY
Elastic Potential Energy - energy that depends
on how much an object is STRETCHED or
COMPRESSED
FORMS OF ENERGY
Mechanical – energy of motion & position
Thermal – energy of microscopic particles
Chemical – energy stored in chemical bonds
FORMS OF ENERGY
Electrical – energy associated with electric charges
Electromagnetic – energy that travels in waves
Nuclear – energy stored in atomic nuclei
FORMS OF ENERGY
Is the energy staying in the same form
in each of these pictures?
ENERGY CONVERSION - process of
converting energy from
one form to another
Name some energy conversions
Is any energy LOST in the conversions?
LAW OF CONSERVATION
OF ENERGY - states that energy
CANNOT be created nor destroyed
(can only be converted)
BEGINNING E = ENDING E
LAW OF CONSERVATION
OF ENERGY
Albert Einstein – famous scientist to
theorize that energy & mass are equal
– He also theorized that energy & mass can
be converted into one another
E = mc2 (theory of relativity)
TYPES OF ENERGY
RESOURCES
Nonrenewable – exist in limited quantities &
cannot be replaced (except over millions of
years)
– creates pollution
– ie. fossil fuels
(oil, natural gas, coal)
& uranium
TYPES OF ENERGY
RESOURCES
Renewable – can be replaced in a short period
of time
– creates very little/no pollution
– ie. hydroelectric, solar,
geothermal, biomass,
nuclear fusion & wind
RENEWABLE ENERGY
RESOURCES
Hydroelectric – energy obtained by flowing
water
– Gravitational PE  Kinetic E
– Water turns turbines connected to
generators
– Pros- low cost & no pollution
– Cons - hampers fish spawning, requires lots
of land & disrupts animal habitats
RENEWABLE ENERGY
RESOURCES
Solar – sunlight converted into usable energy
– Uses panels or photovoltaic (PV) cells
– Pros - no pollution
– Cons - high cost & climate dependent
Geothermal – thermal energy beneath Earth’s
surface
– Pumps water into ground which turns into
steam & drives generators
– Pros – no pollution
– Cons – not widely available
RENEWABLE ENERGY
RESOURCES
Biomass – energy stored in living things
– Burning wood, garbage & crops
– Creation of biofuels
– Pros – never ending supply
– Cons – some pollution
Nuclear fusion – fusion of hydrogen atoms
– Pros – little waste & no pollution
– Cons – technology not advanced enough
RENEWABLE ENERGY
RESOURCES
Wind – horizontal movement of air turns
turbines which turns a generator & creates
electricity
– Pros – no pollution
– Cons – need wind, eye sore & requires lots of
land
ENERGY CONSERVATION – finding
ways to use less energy or use
energy more efficiently
ie. Turn off lights, carpool, energy efficient
appliances & light bulbs
Can you think of other ways to conserve
energy?
WORKS CITED
users.tpg.com.au
tiki.oneworld.net
www.naseg.co.uk
www.lpea.com
espn.go.com
www.hsdejong.nl
techalive.mtu.edu
www.phschool.com
www.flickr.com
www.helixcharter.net
www.maltaconference.com
ffden-2.phys.uaf.edu
www.danishexporters.dk
www.efluids.com
www.edha.co.uk
www.free-graphics.com