Designed to provide an interesting and informative demonstration of series and parallel circuits in a three bulb arrangements that is easy to use, while offering counterintuitive elements to pique student interest and involvement. The large scale apparatus uses three household lamps of different wattage that are connected in series or parallel, and two possibilities of series-parallel, by using two s-position rocker switches. The pre-wired connections are on the circuit diagram copy master. Bulbs (40W, 60W, 100W) are required but not included.