The document discusses electrical supplies and materials used in electrical installation and maintenance. It describes common electrical materials like convenience outlets, male plugs, lamp holders, switches, fuses, circuit breakers, junction boxes, and utility boxes. It also discusses electrical wires, conduits, clamps, and connectors. The document provides examples of how these materials control electrical current flow, carry current, hold wires, and protect buildings from damage. It concludes with an activity asking students to identify electrical tools and materials and list those needed to make an extension cord.