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