how to build a battery generator for a science fair project?
914175
Depending on the size of the Battery. Find an electric motor that use the same voltage and connect an outside source to turn it. Motors work on the same principle as a generator (To be simple about this). If, you apply voltage to the motor it will turn, if, you turn the motor in some way; it produce voltage. You can test what I say with window fans. Take two and face them toward each other. Turn on on high and it will make the other fan turn. Take an AC volt meter and measure the voltage at the plug of the fan that being turned. The faster you can make the fan turn the better your output voltage. This work the same with a little electric motor for your generator. If, it run on 12 volts DC then it will output the same, if, it turned fast enough and actually charge a battery. Hope this enough to help.
487293
Do a search on this site..  \nregarding solar energy.
121952
You can find science fair projects for free in these web sites.\n\n1) www.all-science-fair-projects.com\n2) www.scifair.com\n3) www.super-science-fair-projects.com\n4) www.freesciencefairproject.com\n\n If it these wouldn't help you can e-mail to me and ask again.
886827
My kids use this website to get their science fair ideas http://school.discovery.com/sciencefaircentral/ It has project ideas, tip sheets, step-by-step instructions on basic science fair setup, etc.\n\nGood luck!
361367
atach a wire to each part of the batter, attach them to the light. create a circuit and you will have light
847700
i would try to find two sheets of a fine metal mesh. Use the first sheet to charge the incoming air and the second sheet as the negative attracting grid. place them about an inch from eachothers and attach the positive and negative terminals each to a sheet. I would use a car battery as this gives you the most voltage of something that is portable. Whatever source you get make sure it is dc and that each sheet of wire mesh is insulated from the other or else the electrostatic effect wont work. Or if you have ever seen the ionic breeze by sharper image it uses three or four metal plates placed side by side to achieve dust collection. This may work also.
563439
Build a solar cell from a couple of thin sheets of copper and some salt water.  It requires a heat source, but with parental supervision it can be done by a 4th grader.  Easy!\n\n(see links below for how it's done)
422427
You need the following:\n- Solar panel(s)\n- Batteries\n- Charging regulator\n- Low voltage cutoff\n\nThese last two will keep your battery from dying quickly.  They are often in the same device now.  Expensive, but much cheaper than new batteries every year (I had to learn the hard way on this one).  \nThe most difficult part is estimating how much battery/solar panel you need so you don't run out of electicity.  Also you need to match the solar panels to batteries.  It does not help to have a lot of battery capacity and a tiny panel or vice versa.  Most shops that sell these things can help you with this.
1020503
1. A battery lighting up a filament bulb.\n\n2. Use LM317 IC to build a constant current source.\n(http://www.uoguelph.ca/~antoon/gadgets/sccs.htm)\n\n3. Battery Charger
387233
All of these seem to have good starts for ideas.  You should be able to find plenty of good projects that you'll be able to work on prior to your science fair,\n\nhttp://yahooligans.yahoo.com/Science_and_Nature/Experiments_and_Activities/Science_Fairs/\nhttp://www.ipl.org/div/kidspace/projectguide/\nhttp://school.discovery.com/sciencefaircentral/\nhttp://www.scifair.org/\nhttp://www.cdli.ca/sciencefairs/\nhttp://www.isd77.k12.mn.us/resources/cf/ideas.html\nhttp://staff.washington.edu/chudler/fair.html\n\nGood Luck
134797
http://www.howstuffworks.com\nThey may have a link.\nThey did for building a wind powered generator.
458802
Well, if you can't even spell "solar" I doubt you would have the skills to mount and solder more than 2,000 4"x4" solar cells together, add blocking diodes, and wire the whole thing up in a weatherproof frame without breaking about half of the delicate little buggers.  If you need that much power, you're not going to save much of anything by trying to build your own.  Buy some ready made.
822817
the above one of solar cell is gr8\nor you can make a model of a wind mill, attach it to a motor and then, artificially, rotate it to produce current in the motor and connect it to a small bulb to show it lighting
709848
The following link has some good ideas for different projects.  \nhttp://www.all-science-fair-projects.com/category0.html\n\nAlso, the following link might help you set up a science fair display board if you have to have one.\nhttp://www.sciencebuddies.org/mentoring/project_display_board.shtml\n\nAn easy, but unique, project for a science fair entry is to test different types of materials for fire resistance.  My daughter used wool, cotton, satin, silk, rayon, nylon, and polyester.  All that is really needed for the experiment is the different materials and a candle with a small flame.  Make sure that you make your science board really neat and legible and clearly state your hypothesis and your observations.  Then, write a conclusion about what you learned from your experiment and whether or not your experiment proved your hypothesis.  Good luck!
743232
I'd suggest a minimum 5kW generator.  I can't imagine the sewing machines being more than a few hundred watts operating power, and it is unlikely all five will start up at once for surge currents to add.  There should be plenty of headroom left over for the fans and lights.\n\nVisit my home generator page for other ideas.\nhttp://members.rennlist.org/warren/generator.html
329463
Home made, a 24 volt car battery and jumpercables, a piece of iron rob work well. If my use a cattle prod.That is what I use grabblin for catfish.
788768
Just the usual stuff.  Use an electrolyte (H2SO4/HNO3), a couple of electrodes, a reduction table of half cell potentials, and some electricity.