# All Science Fair Projects

## Over 1000 FREE Science Fair Project Ideas!

 Topics  > Physics  > Electricity
 How does a bar magnet's field interact with the earth's magnetic field?The magnetic field around a permanent magnet, like the gravitational field around a massive object, is not only invisible, but hard for students to comprehend. With no concrete experience to draw from, they tend to ignore this basic concept, or at best, memorize facts about it. This activity shows how to map a magnetic field, and to find how a bar magnet's field combines with the Earth's magnetic
Difficulty: Elementary school
 How does a change in temperature affect the current, voltage and power generated by a solar cell?The purpose of this experiment was to determine how different temperatures affected the voltage (mV), the current (mA), and the power (watt) generation of a solar cell.
Difficulty: Elementary school
 How does a hydroelectric plant produce electricity using water?Hydroelectric facilities are built at the base of dams to take advantage of the high pressure of the water at the bottom of a reservoir. The water pressure is funneled through a tunnel through the dam called a penstock. The water then is focussed on the blades of a turbine. Water pressure of the water turns the turbine, and the turbine turns a generator making electricity. This simple experiment w
Difficulty: Elementary school
 How to build a levitating train using magnetsThis is a great demonstration of like poles repelling each other. We have a platform which floats above a pair of magnetic tracks, and can be gently pushed to one end or the other. This is similar in concept to the MAGLEV trains which are being worked on in Germany, Japan and France
Difficulty: Elementary school
 How to build a lightning storm detector (Franklin's Bells)The toy is a high voltage motor that acts like a bell, with a clapper that bangs furiously from one can to the other and back again, sometimes several times per second.
Difficulty: Elementary school
 How to build a magnetic linear acceleratorThis very simple toy uses a magnetic chain reaction to launch a steel marble at a target at high speed. The toy is very simple to build, going together in minutes, and is very simple to understand and explain, and yet fascinating to watch and to use.
Difficulty: Elementary school
 How to build a simple electric generatorThis is an AC electric generator which is capable of lighting up a tiny incandescent light bulb. The generator is made up of a hollow-ended cardboard box with a nail through the center, many turns of copper wire wound around the box, and four larger magnets clamped around the nail. When the nail and magnets are spun fast by hand, the little light bulb lights up dimly.
Difficulty: Middle school
 How to build a wind turbine generatorThese plans are for the construction of a machine called a Savonius wind turbine. Wind turbines come in two general types, those whose main turning shaft is horizontal and points into the wind, and those with a vertical shaft that points up. The Savonius is an example of the vertical axis type. It consists of two simple scoops that catch the wind and cause the shaft to turn.
Difficulty: High school
 How to build a wireless telegraph setThe simplest wireless telegraph set consists of a means of generating and controlling a spark which sends out radio waves into the air, and a receiver or detector to detect the radio waves. Probably the simplest way to generate and control a spark is to use a switch (called a telegraph key) to turn on and off a buzzer which generates sparks. The simplest way to receive or detect the radio waves ge
Difficulty: High school
 How to build an extremely sensitive electroscope for detecting static electricityThis simple circuit can detect the invisible fields of voltage which surround all electrified objects. It acts as an electronic "electroscope."
Difficulty: Middle school
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