The final uncluttered layout clearly resembles the theoretical circuit diagram where each component is displayed/ accessible over the board. Electricity And Electronic Trainer Locktronics system consists of elctronic components mounted underneath tough molded polystyrene carriers with the appropriate circuit symbol displayed on the upper surface of each carrier and the component mounted securely beneath it. Circuits are assembled by inserting the component carriers between the metal baseboard pillars which act as connectors. Electricity And Electronic Trainer "active schematic" kit allows students to gain a foundation in the principles of electricity and electronics. Graphic symbols are screened onto each components acrylic background. A very affordable unit. Electricity And Electronic Trainer provides hands-on working knowledge of voltage, current, and resistance with series and parallel circuits.