US Patent 8221182 Three-dimensional structures with electronic circuit paths and safety circuits

A three-dimensional electro-mechanical system for making mechanical structures using snap-together parts or building blocks that easily demonstrate the principles required in making three-dimensional electronic circuits incorporated in the mechanical structures. A reusable electronic module that contains batteries or other power sources and has means for attaching to other electronic modules to power these three-dimensional circuits and prevent and warn the user of excessive current.