Balloons and static electricity: http://phet.colorado.edu/en/simulation/balloons


John Travoltage: http://phet.colorado.edu/en/simulation/travoltage

 

Falstad Field lines: http://www.falstad.com/vector2de/


Field lines 3D http://www.falstad.com/vector3de/


Charge and Field (Phet): http://phet.colorado.edu/sims/charges-and-fields/charges-and-fields_en.html


Batteries and voltage: http://phet.colorado.edu/en/simulation/battery-voltage


Circuit construction kit: http://phet.colorado.edu/en/simulation/circuit-construction-kit-dc

 

Magnetic field lines around current : http://www.falstad.com/vector3dm/


Bar Magnet field lines with compass: http://www.walter-fendt.de/ph14e/mfbar.htm


Wire magnetic field lines with compass: http://www.walter-fendt.de/ph14e/mfwire.htm


Lorentz Force: http://www.walter-fendt.de/ph14e/lorentzforce.htm


DC motor: http://www.walter-fendt.de/ph14e/electricmotor.htm


Generator: http://www.walter-fendt.de/ph14e/generator_e.htm


Electromagnetic induction (Phet): http://phet.colorado.edu/en/simulation/generator