  This simple circuit has just one device, not counting the switch ... it's the light bulb. If you were to open the switch, the circuit would be broken, and the light bulb would go out. There are more complicated circuits, of course; let's look at one with two light bulbs on it. The circuit diagrams on these pages were made using 'Crocodile Clips', a wonderful little freeware program that lets you build and test your own circuits, with motors, light bulbs, resisitors, and switches. You can find out more about it, and how to download it, by visiting our Crocodile Clips page. You can now get this entire set of pages about 'Circuits' as a single stand-alone executable file that will run on any computer. Get 'Circuits' here. (350 k, zipped) |