Tuesday, February 24, 2009

Making electricity

Dear Children -

Did you know that electricity can be made from anything that creates constant motion? One of the most common ways to make electricity is to use the motion of water falling, like a waterfall, and change the energy of that movement into electric power that is then sent through wires to homes and businesses. A huge waterfall can provide enough energy to supply electricity to many cities.

Another way to make electricity is to use heat to provide the energy that is turned into electric power. A popular method in the United States is to burn coal for its heat, but this is a polluting method that produces lots of carbon dioxide. This is one of the reasons that anyone who wants to fight global warming needs to use less electricity every day. We need whole cities to use less electricity.

Clean ways to make electricity include the giant windmills that we can see now along mountain ridges and in the ocean near the shore. Today I read about a way that a college in California is making electricity: when hundreds of students go to the fitness center to walk on treadmills and ride stationary bikes, the college captures the energy from all that motion to make electric power. Isn't that super?

From Nana Greta


Anonymous said...

Dear Nana Greta,
Have you ever seen a real windmill before? I have alot at my uncle's farm before. And my uncle told me that they produce electricity.
From Alasdair

Anonymous said...

Dear Nana Greta,
This is Kiara I just read what you wrote about electricity and I think what you wrote is true now I kinda want to fight global warming because you just inspire me! I will now make my family save the envierment and save electricity. I wish I can walk with you.

Anonymous said...

Dear Nana Greta,
I do not like global warming either. I just read a book and they wanted to cut down a living tree that still had leaves on it so they could make a parking lot. They should let the tree die on its own. I recycle to solve global warming just like you're walking to solve global warming. Have a great time!
From Kevin

Anonymous said...

Dear Nana Greta,
This is Sashala and Maria. We just read a book called "Save Our Park Tree." The book it's about that they're trying to save a tree because if they cut it down it will take away the shade for the people. If they cut all the trees, will more trees grow to make oxygen?
From Maria and Sashala

Greta said...

Hi Alasdair - Where is your uncle's farm? It's wonderful that there are windmills there. I'd love to see them and talk to your uncle about how things are going.

Hello Kiara - I'm glad you would like to fight global warming and help save our environment. If your family works to save on electricity it will help the environment and it might also lower our electricity bill.

Hi Kevin - Recycling is a good thing. When I've visited the Boston area I notice that a lot of people don't recycle, so congratulations on your efforts.

Hello Sashala and Maria - Your question about trees is an important question. Yes, more trees can grow to replace the ones that are cut down, but it takes trees a long time to be big enough to make a lot of oxygen. Many trees in the old forests are over 100 years old. Their roots protect the land around them, holding the earth together when if rains. New trees don't always have the best conditions to grow strong.

Love, Nana Greta

PaulGennetti said...

I realy realy realy hope that youre walk will work. to Greta from Paul