These tabletop interactives were made as part of a series of visitor centres we designed, built and installed for EDF Energy. They take the form of a series problems that must be solved; the first on how to wire up a lightbulb with on-off switches at the top and bottom of a set of stairs, and the second on which material is the best conductor. The other two demonstrate the principles of electrical resistance and how a motor works. Users solve the problems by experimenting with various positions of the patch cables plugged into jacks in the top surface. The internal circuitry is housed in durable acrylic cases with jacks, patch points and buttons fixed to the top plate.