This simple experiment shows you how to demonstrate magnetic shielding and explains how it works.
http://www.exploratorium.edu/snacks/magshield/index.html
If the solar cell is placed perpendicular to the sun's rays, the power going to the cell will be maximized
http://www.collaboratory.nunet.net/timber/scifair/eigthc/3.htm
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.
http://www.eduref.org/cgi-bin/printlessons.cgi/Virtual/Lessons/Science/Earth_Science/EAR0022.html
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.
http://www.selah.k12.wa.us/JHS/Brown/CALEBCSCIPROJ.HTML#top
This 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.
http://my.execpc.com/~rhoadley/magtrain.htm
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.
http://www.scitoys.com/scitoys/scitoys/electro/electro4.html
This very simple toy uses a magnetic chain reaction to launch a steel marble at a target at high speed.
http://www.scitoys.com/scitoys/scitoys/magnets/gauss.html
This 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.
http://www.amasci.com/amateur/coilgen.html
These 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,
http://www.re-energy.ca/ridethewind/buildamodel-1.shtml
The 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.
http://www.chss.montclair.edu/~pererat/perwirls.htm