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Wind Energy

Wind isn't just some uncontrollable part of nature that messes up our hair or sucks up Dorothy, Toto and anything else in its way. It can't be trained but it can be put to work. The kinetic energy of wind can be changed into other forms of energy. When a boat uses a sail to push it, that is one form of wind energy at work. Farmers have been using wind energy for years to pump water from wells and turn large stones to grind wheat or corn - just like a water wheel.

Wind is also used to make electricity. Blowing wind spins the blades on a wind turbine - just like when you blow on a toy pinwheel. When the blades turn, the turbine is operating and electricity is generated. The turbine has a brake, so if the wind blows too hard, the brake can stop the blades from being damaged. Some wind turbines are up to 10 stories high and have blades as long as 50 feet. Wind turbines don't create any pollution but they can be pretty noisy.

Wind has to blow at speeds of 12 to 14 miles per hour to turn the turbines fast enough to create electricity. The turbines usually produce about 50 to 300 kilowatts of electricity each. Kilo means 1,000, so a kilowatt is 1,000 watts. You can light ten 100 watt light bulbs with 1,000 watts. This means a 300 kilowatt wind turbine could light up 3,000 light bulbs that are 100 watts.

Wind turbines are grouped together in what are called wind farms. About 30 percent of the world's electricity is made from wind in California. They have three large wind farms that create enough electricity to supply a city the size of San Francisco with power. Two countries that use a lot of wind energy are Denmark and Germany.

The world's largest wind machine is on the island of Oahu, Hawaii. The windmill has two blades, 400 feet long, on the top of a tower which is 20 stories high.

Do you have any windy day stories? Comment below if you do!

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Fave Electrical Gadget?

  • It's all about my GameBoy.
  • I couldn't live without my cell phone.
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General In The Forums

AlphaT
AlphaT posted in Debating:
On a "normal" person, Polygraphs have a 70%-90% success rate. Now, the problem is that a lot of people aren't "normal". Some people are naturally anxious or have an anxiety disorder, which can mess up the results. Obese people often tend to sweat more, which will give the sensors bad readings.  So, is it a good tool for finding the truth? In certain circumstances, yes. Is it enough to convict someone of a crime? No. 
reply about 3 hours
XxRuby_PhoenixxX
Definitely not. A person can learn to control their heartbeat and lying skills, so the tests are most definitely NOT a accurate. 
reply about 3 hours
iambatman
iambatman posted in Say Anything:
Kirsteeeeen said I should post this so yeaOk so some things about my depression are like i found out i had it when i was 10. I might of had it before then but Idk. But like is a good thing i joined kw cause that's how my friend on here like figured out that i have depression and basically made me tell my mom and dad. And like also i kinda wanted to die and stuff and then later i kinda wanted to kill my self. And hurt my self. I kinda did a little bit but like not that much. And so like i had to do this weird therapy that didn't work. And then it kept getting worse and stuff and then like i went to the doctor and got some medicine but like they didn't give me any for almost a year probably until i was closer to 12. But the first one they tried made me like wake up sometimes and basically be really anxious like freaking out so much that i thought i might hurt myself or kinda other people or do things like run away. But it kinda helped the depression during the day and helped me to sleep sometimes better but like also i stopped wanting to do anything. So then i got a different one but it made me dizzy as soon as i tried it basically and so like after 3 days maybe then I spotted. But then i had to wait for them to get out of my system. After that i starred like regular therapy where you talk to the therapist. Like people told me it was bad so i really didn't want to go for a long time, but i went and it was kind of fun i guess like i could say anything and he wouldn't like be mad about me saying it or anything like he didn't judge and stuff. So i did that for a while like 2 or 3 months and i was feeling a lot better from that and some off the things we did. But like since my dad got a new job it has different insurance so i have to switch but we're just waiting to see like if i need to right now
reply about 4 hours
AlphaT
AlphaT posted in Debating:
EDIT:  With the events in North Korea, I think it's likely that some sort of military conflict will occur in the near future. But it wouldn't be a "World War". North Korea has two "allies" on the planet, that being China and Russia. China's President has signaled a withdrawal of support from North Korea, and Russia so far has been silent on what's been happening.  Basically, if there is a war, it will likely be The World vs Kim Jong Un. 
reply about 4 hours
Sophieex_
Sophieex_ posted in Debating:
Pretty self-explanatory; debate away! And remember, as always, please be civil! :) ❤️ @Sophieex
reply about 6 hours