Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and electrons slowly creep along a wire. The light turns on when the signal reaches it. This simulation of a Signal Circuit is from the...

Authored and curated by David P. Stern, these web pages introduce the concept of work and its relation to energy. An example of electric work and energy using the example of a Van de Graaff Generator. These pages are...

This page, authored and curated by David P. Stern, illustrates the concept of work against an electric force using the examples of the Van de Graaff generator and lightening. There are also shorter examples of the Xerox...