American Educational Five Lamp Economy Parallel and Series Circuits Board, 15-1/2" Length x 5-1/2" Width x 1-1/2" Height Parallel and series circuits are demonstrated using this easily convertible lamp board Five mini receptacles are mounted on a clear acrylic base Buss bars connecting the receptacles allow for quick changing from parallel to series and many combinations of the two Parallel and series circuits, instructions are included Measuers: 15-1/2" length by 5-1/2" width by 1-1/2" height