Chapter 1. Magnetism and Electricity -- Magnetic Poles -- Experiments with Magnets -- Formation of Permanent Magnets -- Aiding and Opposing Magnetic Fields -- Electromagnetism -- Volts, Amperes, and Ohms -- Electric and Magnetic Circuits -- Understanding Electric Circuits -- Kirchhoff's Voltage Law -- Electrical Power -- Quick-Check Instruments for Troubleshooting -- Chapter 2. Conductors and Insulators -- Classes of Conductors -- Conducting Wire -- Circular Mil-Foot -- American Wire Gauge -- Stranded Wires -- Aluminum Wire -- Line Drop -- Temperature Coefficient of Resistance -- Earth (Ground) Conduction -- Conduction of Electricity by Air -- Conduction of Electricity by Liquids -- Insulators for Support of Wires -- Classes of Insulation -- Insulation Resistance -- Plastic-Insulated Sheathed Cables -- Chapter 3. Electric Circuits -- Picture Diagrams and Schematic Diagrams.