RevSlider Test

Say everything you can recall.
 Check it. Did you forget something?
What did you do last time? wall socket power plant grid generator motor turbine PRINT the word next
to the image on the next slide. And you learned    about turbines. Last time you spun a pinwheel. You can spin the blades of
a pinwheel with air or wind. Can you also spin the blades of a turbine with wind? In windy areas wind turbines are now one of the most cost effective sources of electricity.

 The blades spin the shaft
of the generator as they turn
and this produces electricity. YES, wind generators use WIND
to spin a turbine and generate power. The blades of a wind turbine spin when the wind is blowing. 1 2 3 Wind farms can be on land or offshore. Have you ever seen
a wind farm? Look for the purple, lavender, red
and orange regions on the map.

This is where wind power is the
most plentiful in the U.S.A.

Offshore wind is plentiful, too. Where DOES the wind blow
the most in the United States? There is enough wind
to power the entire
planet many times over!

Wind power
supplies 11%
of current demand.

In Denmark
it is close to 60%. Flowing water!

Try it! Can you think
of another way
to spin your pinwheel? The spinning turbines turn the shaft which turns the generator producing electricity. The water from the reservoir has to
plunge DOWN through long pipes
onto huge steel blades of the turbines. Hydroelectric Power The water must be higher
than the power plant. Why? THE LONGER THE PLUNGE,
THE GREATER THE FORCE ON THE BLADES! Many hydroelectric power plants hold water in a reservoir or lake behind a dam. 1 2 Dams make huge changes in the rivers below. What are some of these changes? The still water in the reservoir
is heated by the Sun, changing
what can live in the river. The silt that would fertilize a
downstream river is trapped within
the reservoir. Can you imagine what will happen to the dams over time? The dam also blocks fish, such as
salmon, from swimming upstream
to produce their young. 1 2 Dams can cause problems! 3 1 / 3 Now due largely to factories in Asia
 COAL produces



of the world's power! Is burning COAL a problem? Why is burning COAL such a problem? Let's figure this out. Coal is made from long dead plants
compressed into rocks
about 300 million years ago!
SO, . . . Coal is a rock that burns!
Let’s burn some coal! tea
candle very small piece
of bituminous coal jumple sized
metal paper clip Find these items. glass or bowl
of water 1 ADULT SUPERVISION REQUIRED! Unfold the paper clip. The tiny piece
of coal should
fit tightly in the
paper clip loop. ADULT SUPERVISION REQUIRED! 2 3 What did you notice most about the burning coal? Have an ADULT
light the candle. ADULT SUPERVISION REQUIRED! Light
the coal
with the
candle flame.
Let of burn. Use water
to extinguish
the burning
coal.
Put out
the candle. 4 5 6 Were the fumes stinky and smelly? The burning of a tiny piece
of bituminous coal
made very stinky fumes!

As large amounts of coal are
burned in boilers to make steam,
a LOT of pollutants go into the air.

Imagine the smell! STINKY Bituminous COAL! Coal is a fossil fuel. Natural gas is a fossil fuel. Petroleum is a fossil fuel.
 They are ALL fossil fuels formed many millions of years ago from
the buried, compressed remains of ancient plants and animals. These pollutants cause
a LOT of sickness in people!

Fossil fuel pollutants cause and make asthma attacks worse!

Do you know someone
who has asthma?

Fossil fuel power plants are dirty. Many places are replacing them with clean wind and solar power. Fossil Fuel Pollutants Cause Respiratory Disease HOW do we use coal and
other fossil FUELS to make electricity? This pressurized steam
is released
and aimed at
turbine blades.

These blades spin the shaft
and turn the generator.
 We use these fossil fuels
to make STEAM!

Inside a boiler the flames
from the burning fuel heat
the water inside pipes.

As the water boils
in the pipes,
it becomes STEAM.
 ELECTRICITY! We use fossil fuels:
coal, petroleum, and natural gas to boil water! Let's boil this down. to make steam! Spin a Turbine! Step 3 Step 2 Step 1 Step 5 Select Systems
with the turbine
on the right Top right, click
on Enegy Symbols Select Systems.
Explore energy transfers. Step 4 Try the bicycle. Keep the bicyclist fed!
Watch as energy transfers from one form to another. Boil water, make steam, spin the turbine, ligh a bulb
or rotate a fan. Spin the turbine
with water to light
a bulb. Click and follow
the directions below. into the atmosphere
when burned to produce STEAM or GAS.
carbon dioxide gas
(CO2), Coal
and other Fossil fuels release So WHY is this a problem?
 CO2 and other gases are greenhouse gases. What is a greenhouse gas? Greenhouse gases trap the heat from the Sun
in the atmosphere, much like your
blanket traps your body heat beneath
your covers to keep you warm. Increases in carbon dioxide gas in the air are holding in so much heat that we are seeing major changes in the Earth’s climate! The Earth is overheating! Name three ways
to spin a turbine Do wind turbines release CO2
(a greenhouse gas) into the air Does a hydroelectric
power plant release CO2
(a greenhouse gas) into the air Do coal-fired power plants release CO2 (a greenhouse
gas) into the air 1 2 3 4 5 Name 3 fossil fuels
 YES blowing wind, falling water, pressurized steam or gas NO NO coal, natural gas, and petroleum