Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

It's wires that connect to different electrical components, like a light bulb, a switch, and a battery. JAMES: Yeah, there are actually two types of circuits. We have series circuits and parallel ...

It's a simple string of miniature light bulbs, with some wiring inside that connects everything ... each light is tested again for electric charge. Then the machine covers the metal piece in ...