Transcript What do you know about light?

Power
Stationary Power
• Canadians use about 2 000 000 000 000
000 000 J of electrical energy each year!
• Most of Canada’s electrical energy comes
from harnessing rapidly flowing rivers,
burning fossil fuels, and splitting atoms
to release nuclear energy.
Energy from Flowing Rivers
• Hydro-electric plants produce most
of the electrical energy used in
Canada.
• Hydro-electric plants use water
pressure to generate electrical
energy.
Energy from Fossil Fuels
• Coal, crude oil, and natural gas are
products of once living tissues.
• Tremendous pressure and heat
converted these decaying tissues into the
materials we call fossil fuels.
• Burning fossil fuels produces large
amounts of carbon dioxide gas, one of
the biggest contributors to pollution.
Energy from Splitting Atoms
• During the process of nuclear fission a
tremendous amount of energy is released
(along with excess neutrons).
• The process of generating electrical
energy through nuclear fission is called
thermonuclear electrical generation.
Canada’s Energy Resources
• Over 98% of Canada’s electrical
energy is produced by hydroelectric, thermoelectric or
thermonuclear plants.
Delivering Energy to the
Consumer
• Power plants are generally located
great distances away from cities and
communities in which they serve.
• Consequently energy must be
transmitted over many kilometers of
power lines.
Changing the Voltage
• Electrical transformers are devices
that can increase or decrease the
potential difference for power
lines.
• Use the diagram on page 400 in the
text book to fill in your diagram.
Energy Bucks
Waking Up
• Alarm Clock or Radio...........................................2
Breakfast
• Microwave...............................................................2
• Stove/Oven.............................................................5
• Toaster Oven..........................................................3
• Refrigerator.............................................................3
Ready for School
Ready for School
• Air Conditioning/Heating................................10
• Radio/CD Player …………………………………... 2
• TV/DVD Player.................................................3
• Shower/Bath.....................................................3
• Hair Dryer..........................................................3
• Curling Iron/Curlers/Straightner.......................3
Room Lighting
Room Lighting
• Bedroom..............................................................2
• Bathroom............................................................2
• Kitchen...............................................................2
• Family Room.........................................................2
• Other...................................................................2
Getting to School
Getting to School
• Walk..................................................................0
• Bicycle...............................................................0
• School Bus...........................................................1
• Carpool...............................................................2
• Family Vehicle....................................................5
After School
After School
• Air Conditioning/Heating................................10
• Travel in Vehicle....................................................5
• Lights........................................................................2
• Computer................................................................3
• Video Game System............................................3
• CD Player/Radio....................................................2
• TV/DVD Player.......................................................3
• Telephone...............................................................1
• Snack Preparation................................................2
Last Night
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Air Conditioning/Heating................................10
Microwave...............................................................2
Stove/Oven.............................................................5
Toaster Oven..........................................................3
Refrigerator.............................................................3
Grill............................................................................2
Lights........................................................................2
TV/DVD Player.......................................................3
Shower/Bath..........................................................3
Hair Dryer................................................................3
Electrical Energy and the
Environment
Effects of Hydroelectric
Plants
• Hydroelectric plants appear to be
the cleanest of the top 3 producers.
– There are no smokestacks, they use no
radioactive material.
• But…
• Reservoirs flood many acres of
valuable land.
• When lands are flooded, the
submerged vegetation decays and
uses up the oxygen supply in the
water, making it impossible for fish
species to survive.
Effects of Fossil Fuels
• Open pit mining leaves land destroyed
and unproductive.
• Underground mining produces waste that
can seep into water supplies.
• Burning fossil fuels produces acid rain
and an abundance of carbon dioxide, the
main contributing gas to global warming.
Effects of Nuclear Energy
• The radioactive materials used can
damage living tissues.
• If a nuclear reactor breaks down
there is the potential for immediate
and very serious damage to people,
animals and property.
Alternate Sources
Types of Alternate Energy:
• Solar Energy: Energy from the sun
using solar panals.
• Wind Energy: Energy from windmills
• Tidal Energy: Using the difference
in high and low tide to generate
electricity.