Transcript Volcanoes - Cloudfront.net

Question of the Day
Question: What do you think is meant by
“Alternative Energy?”
Answer: … … …
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19.2 Worksheet (1/2 Page)
Electricity
What is electricity?
• Electricity is the flow of
electrons from negative to
positive
How did we discover
electricity? • Many people
think Benjamin
Franklin
discovered
electricity with
his famous kiteflying
experiments in
1752, but
electricity was
not discovered
all at once.
Discovery of Electricity
• In 1800, Alessandro
Volta, an Italian
scientist, created the
first battery
• What is a battery?
• Device that can convert
stored chemical energy
into electricity
The First Electric
Generator
• 1821: Michael Faraday
was the first one to
realize that an electric
current could be
produced by passing a
magnet through a
copper wire
• this was the first
generator
Electricity for Everyone
• 1879: Thomas Edison
invents the light bulb
• 1882: He designs and
builds the first electric
power plant
• How we get our
electricity today
How much would that
cost?
• If they used 200 kWhr in 1/7 sec
• At a cost of .1 $/kWhr for 12 hours
$ = 200 kWhr x 12hrs x 3600s x $ .1
1.7 s
hr
kWhr
= $508,235/ night
How do we generate
electricity?
1. Burn something: coal, natural
gas, oil, “Nuclear Fuel”
2. Heat water
3. Steam turns a turbine (fan)
4. Turbine spins an electric
generator
Generating Electricity
Why does he wear a metal suit?
What are the 3 things he is afraid of?
Electric Generator
Function
• In a power
plant the
spinning of
magnet
relative to a
coil of copper
wire
generates
electricity
Electrical Generation
Which spins in a hydroelectric power plant generator,
the magnet or the coil of wire?
What do they do to the voltage before they deliver
electricity to the home?
Electricity Generation
CO2 & others
Fuels:
Coal,
Oil,
Natural
gas
Fire
Nuclear
Is there a better way?
•
•
•
•
Burn something
Heat water
Turn a turbine
Generator generates electricity
which can be sent to homes and
businesses
Hydropower
Geothermal
Geothermal
How deep are geothermal wells?
What do they use the steam for?
Why is geothermal considered a sustainable energy
source?
Wind Power
Is there an even better way?
•
•
•
•
Burn something
Heat water
Turn a turbine
Take in solar energy and
convert it to electrical energy
Solar Panels
Solar panels convert photons to
electricity
Solar Power
Why is solar power important for the Brazilian
village?
What could solar powered airplanes replace?