This is an electronic circuit simulator.  When the applet starts up you will see an animated schematic of a simple LRC circuit. The green color indicates positive voltage.  The gray color indicates ground.  A red color indicates negative voltage.  The moving yellow dots indicate current.To turn a switch on or off, just click on it.  If you move the mouse over any component of the circuit, you will see a short description of that component and its current state in the lower right corner of the window.  To modify a component, move the mouse over it, click the right mouse button (or control-click if you have a Mac) and select “Edit”. The "Circuits" menu contains a lot of sample circuits for you to try. Full Screen version. Directions. Index of Circuit Examples. More applets. Javascript version, posted 6/9/15. Huge thanks to Iain Sharp for the Javascript port. You can still use the original Java version. Thanks to Edward Calver for 15 new components and other improvements. Thanks