JCSP - Technology - JCSP. Engineering Technology Teachers Association. Circuit Simulator Applet. 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. The "Circuits" menu contains a lot of sample circuits for you to try. Full Screen version. Directions. Standalone (offline) versions. Index of Circuit Examples. Main.swf (application/x-shockwave-flash Object) OhmsLaw.swf (application/x-shockwave-flash Object)