The original is here: http://falstad.com/circuit http://falstad.com/circuit He already swapped out the old java version with this same javascript (GWT-based) o

The original is here: http://falstad.com/circuit http://falstad.com/circuit He already swapped out the old java version with this same javascript (GWT-based) one. There are several other good simulations on that site, too, and many other good animated physics simulations here: http://phet.colorado.edu/ http://phet.colorado.edu/ And for those asking what's the use - there's a lot of research on the PHET simulations about their benefits for learning. I myself used Falstad's simulation in my dissertation. Students who just finished their first circuits course used this sim and learned stuff in minutes that they hadn't learned all semester, like what happens when you add a capacitor to a DC circuit, or the difference between capacitors and inductors in an AC circuit, and the effects of changing capacitance, inductance, and resistance in a circuit. In a regular circuits class, you can get by with just memorizing equations, but this simulation helps you understand what the equations mean and what is actually happening in the circuits you learn about.