My child is doing a 4th grade science project for school.  I would like to get simple directions on how to build a telegraph.
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The concept is to build an electromagnet that cuts the circuit when energised. This produce a buzzing effect
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Well see as though you dont really have much time for a project that involves a control... But here is an awesome listing that has loads of ideas with explicit instructions not to mention material list for a wider variety of projects. Since I have no clue what realm of science you were intrested in... This has a little bit of them all! Good Luck!\n\nhttp://school.discovery.com/sciencefaircentral/scifairstudio/ideas.html
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http://science.howstuffworks.com/electricity.htm
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well for my physics project for the boards i made a photoelectronic burglar alarm- at the heart of this was an LDR( Light Dependent Resistor) when the beam of light is obstructed (think laser in the movies-lol) the LDR resistance rises and the circuit inside is set into oscillation and the alarm sounds- other good projects would be a rain alarm, a rectifier, an electroscope,..... the possiblities are endless- i suppose you could do anything involving electric circuits since thats what the cbse calss 12 physics text covers most- i doubt ud want to do anything on ray or wave optics
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Try Yahoo Education, Physics,
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u can try www.hotstuffworks.com which can guide u to the basics of any latest electrical instrument/appliances.its a site of great help..best of luck..
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Here's a site with alot of different ideas and difficulty levels with instructions.  Maybe you can find something here.\n\nOr you can tell us more about what you are wanting to do and what you like and we might be more helpful on here.\n\nhttp://www.all-science-fair-projects.com/
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go to radioshack...they sell basic instruction manuals, circuits and all the bits you'll need
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what about building a;\n\nGyroscope, digital compass, a wireless motion sensor, temperature sensor, force sensor, speed sensor, preasure gauge, etc\n..... for physics i'd try build some kind of sensor just so that you can measure various variables
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Here's a list of links to much information. Have fun.\nI personally enjoyed building sirens as a kid. Fun to annoy the neighbors.
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Found a good diagram here\nhttp://www.laynetworks.com/Block%20diagram%20of%20the%20Pentium.htm
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http://www.stevespangler.com/  Here is where I got the ideas and stuff for my kids when they did theirs.  Good luck!
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Really easy project: http://www.hilaroad.com/camp/projects/clinometer/clinometer.html\n\nEasy trebuchet: http://hila.webcentre.ca/projects/trebuchet/index.htm\n\nEasy dome: http://www.hilaroad.com/camp/projects/dome/dome.html\n\nMeasure the diameter of the sun with geometry: http://www.hilaroad.com/camp/projects/pinhole_sun/sun_diameter.html\n\n\n\nA suspension bridge would be a nice project because the shape of the main cables that holds up the bridge is a mathematical curve called a "catenary."\n\nhttp://www.infovisual.info/05/028_en.html\nhttp://en.wikipedia.org/wiki/Suspension_bridges\nhttp://en.wikipedia.org/wiki/Catenary  (This article explains that the St. Louis Arch is an inverted catenary, and it even gives it's dimensions and the formula of the curve.  You could make a scale model.)\n\nAnd, it looks like I'm wrong  about suspension bridges.  Their main cables are parabolas, because of the weight of the deck.\n\nHere are some more projects you can check out:\n\nhttp://www.astrocappella.com/activities/cosr_lp.html (make the umbrella rigid by painting plaster on it)\n\nSolar reflectors would be good projects using parabolas: \nhttp://www.hilaroad.com/camp/projects/solar_energy/Hila_Solar_Energy.html\nhttp://www.cockeyed.com/incredible/parabola/parabola.html\nhttp://www.humboldt.edu/~ccat/solarcooking/parabolic/parabolic_solar_cooker_pg_3_html.htm\nhttp://peacecorps.mtu.edu/solarcookers.htm\nhttp://jc-solarhomes.com/fair/parabola20.htm
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e-mail me: intel_knight-at-yahoo-dot-com\n\nAnd I have no clue how to build that EMP thing, or if it is even possible. I just thought it would be a cool thing to have.
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Since you need simple and portable, how about starting with something that uses light and prisms to create the spectrum? \nFrom there, you could go to show how rainbows are created ( where the light must be, what the sequence of the rainbow spectrum is) or compare how light colors mix compared to how m=paint colors mix.  I don't know if that is appropriate for the 10 th grade.  But working with light and prisms is always fun.\nmagnetism is always fun, too.
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I don't know if there is just one website to give you all that you are looking for.  Don't let the length of a project paper worry you.  Get a plan first.\nTopic:  Means of Communications\nIn your first paragraph tell the reader what subjects you plan to cover.  There are many different means of communications I will be discussing ........  I will give a brief history on each of them and explain how they are used today.  \nYou could even include in your report a survey that you can conduct about which means is most popular today.  You can have the paper progress from man's early means of communication to today.  The growth of communication from the "town crier", newpaper, postage, telegraph...etc.  I did find one website that might jump start you.  Good luck!
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Materials needed:\n     1 lemon\n     1 paper clip\n     1 copper wire (18 guage works well)\n\nProcedure:\n     1.   Straighten out the wire of the paper clip.\n\n     2.   Cut a piece of copper wire roughly the same length\n          as the paper clip.  Remove the insulation.\n\n     3.   Push the paper clip and the copper wire into the \n  lemon.  Keep the wires as close together as you\n          can, but don't let them touch.\n\n     4.   The fruit battery is now ready for use.  If you\n          have a voltmeter you can test how many volts\n          the battery produces.  You can also taste the\n          two wires and feel a tingle in your tongue.\n          (Note: you should only do this for very low\n          voltages such as those given off by lemons.)\n\nHow it works:\nAcids, such as the citric acid in lemons, tend to produce chemical substances called ions. These ions either have too many electrons (negative) or not enough (positive) Metals tend to attact these ions. \n\nOne type of metal will attract the negative ions and the other will attract the positive ions. This causes the two metals to have different electrical charges and electricity will flow from one to the other whenever you attach the battery to something like a radio (or your tongue). \n\nIncidently, the flow of electricity will eventually neutralize the ions. When this happens the battery is dead. \nand also see: