Check this page live at http://chumo.github.io/the_simplest_circuit/the_simplest_circuit.html
A simple page showing the simplest conceivable electrical circuit, consisting in a DC battery, a light bulb and a switch. The interactivity is provided by D3.js.
Enjoy! Jesús
Attributions
The bulb: http://commons.wikimedia.org/wiki/File%3AGray_Edison_lamp.svg
By Ignacio javier igjav (File:Bombilla amarilla - yellow Edison lamp.svg) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons from Wikimedia Commons