Circuits
Simulation Links:
Electric Circuits: Click on the link below and then the Electricity, Magnets and Circuits section then the Circuit Construction Kit (DC) Simulation
http://phet.colorado.edu/web-pages/simulations-base.html
Electric Fields and Equipotential Lines : Click on the link below and then the Electricity, Magnets and Circuits section then the Faraday's Electromagnetic Lab Simulation