Induction/conduction using electroscope (applet)
http://www.shep.net/resources/curricular/physics/P30/Unit2/electroscope.html
Electric Force Fields
Now that we've seen how electric charges
interact, we can discuss the concepts of electric
force fields and lines of force.
I've heard those terms before, but I'm not sure I
understand them. There seems to be a "force
field" in every episode of Star Trek; it's like an
invisible wall that nothing can penetrate. Is that what a
force field really is?
Not exactly. In physics, a force field is a way to
picture the effects that electric charges have on
one another. Instead of talking about the force a
positive (+) charge exerts on an electron, we can say
the charge creates a force "field" in the empty space
around it. An electron put down at any place in this
force field is pulled towards the + charge; a positive
charge set down at the same place is pushed away.
Try putting down "test" electrons with the mouse to
see which way the field points and how strong it is;
the line points away from the direction in which the
electron will move, and the length of the line tells you
the strength of the force at its current location. You
can drag the mouse, or you can press the "R" key to
have your computer put down electrons.
Charge (electric field) applet
http://www.colorado.edu/physics/PhysicsInitiative/Physics2000.05.98/applets/nforcefield
.html
http://www.colorado.edu/physics/PhysicsInitiative/Physics2000.05.98/waves_particles/w
avpart3.html
http://www.colorado.edu/physics/2000/waves_particles/wavpart2.html
The master website that links to the rest
http://www.hazelwood.k12.mo.us/~grichert/sciweb/electric.htm
Charge fields applet
http://www.mrfizzix.com/utilitypage/dukes/electricfield/ElectricField.htm
http://physics.weber.edu/amiri/director/DCRfiles/Electricity/efiel24s.dcr
Master website for FSU
http://micro.magnet.fsu.edu/electromag/java/index.html
Lightning/capacitor
http://micro.magnet.fsu.edu/electromag/java/lightning/index.html
Capacitor battery
http://micro.magnet.fsu.edu/electromag/java/capacitor/index.html
Induction applet
http://micro.magnet.fsu.edu/electromag/java/faraday/
http://micro.magnet.fsu.edu/electromag/java/compass/index.html
http://micro.magnet.fsu.edu/electromag/java/faraday2/index.html
Electrons through a filament
http://micro.magnet.fsu.edu/electromag/java/filamentresistance/index.html
How a CD works
http://micro.magnet.fsu.edu/electromag/java/cd/index.html
How a hard disk works
http://micro.magnet.fsu.edu/electromag/java/harddrive/index.html
Lenz’s law (for Eddy current demonstration)
http://micro.magnet.fsu.edu/electromag/java/lenzlaw/index.html
How a microphone works
http://micro.magnet.fsu.edu/electromag/java/microphone/index.html
Rutherford empty atom experiment
http://micro.magnet.fsu.edu/electromag/java/rutherford/index.html
Transformer
http://micro.magnet.fsu.edu/electromag/java/transformer/index.html
How a speaker works
http://micro.magnet.fsu.edu/electromag/java/speaker/index.html
Building a transistor
http://micro.magnet.fsu.edu/electromag/java/transistor/index.html