DNA may free man after 27 years
3 月 11th, 2009 by pepboysauto404A man jailed for murdering a barmaid 27 years ago could be released from prison after DNA evidence was reviewed.
A wide variety of fun science fair projects can be done with wind power. Making a windmill is a great way to discover how this energy source works. Windmill science fair projects can focus on studying the effects of a particular part of a wind turbine.
For instance, how does the material of which the blades of a windmill are made affect the windmill’s effectiveness in generating power? What about the angle at which the blades are oriented? What about the length and width of each individual blade? How many blades is it best to have? Is more always better, or is there some golden mean?
Your project could also explore how the speed of the wind affects the amount of electricity a windmill can generate. Science experiments of this sort are easy to run. Get an electric fan that can be turned to a variety of speed settings. The fan will serve as your wind. Then you can observe the effects of wind speed on the windmill’s energy creation in a controlled setting.
Windmill science fair projects could also focus on getting the windmill to perform certain functions - whose level of intricacy will depend on the degree of challenge you seek from the project. You can get your windmill to light an LED or lift a small weight. Model windmills can even be used to charge batteries!
Does the orientation of the windmill’s axis make a difference in terms of electricity generation? You can explore this issue by comparing the performance of windmills with horizontal axes to that of windmills with vertical axes.
To become adept at putting together outstanding windmill science fair projects, consider learning about Ohm’s Law: I = V/R, which expresses the relationship between current (I), potential difference (V), and resistance (R). If you are ever putting together electric circuits of your own, knowing this formula will help you make most of the necessary computations.
Another possibility is to get creative with the basic structure of your windmill - for instance including multiple motors and rotors and seeing if this affects the amount of electricity your windmill can generate. You can have endless varieties of fun with windmill science fair projects. Pick the idea that seems most exciting to you and take it as far as you can. In the process, you will produce a great project that you will be proud of for a lifetime.
Madeline Binder has been developing ideas for prize winning science fair projects for many years. She offers a broad selection of advice, materials, and inspiration for energy science fair projects and physics science fair projects.