Matter, Elements, Compounds, Mixtures, Molecules, Atoms, Electrons, Protons, Neutrons, Energy, Energy Levels, Shells and Subshells, Valence of an Atom, Ionization, "Conductors, Semiconductors, and Insulators", Charged Bodies, Neutral Bodies, Electrostatic Lines, Magnetism, Ferromagnetic Materials, Natural Magnets, Reluctance, Permeability, Retentivity, Magnetic Poles, The North Pole, Weber's Theory of Magnetism, The Domain Theory of Magnetism, Magnetic Fields, Magnetic Lines of Force, Magnetic Flux, Flux Density, Field Intensity, The Intensity of Attraction/Repulsion, Magnetic Shielding, Classification of Magnets by Shape, Energy, The Coulomb, Voltage, Voltage Measurements, Methods of Producing a Voltage, Electromagnetic Induction Generator, Electron Current, Electric Current, Resistance, Material Resistance, Conductance of Materials, The Unit of Conductance, The Resistor, The Carbon Resistor, The Resistance of a Wirewound Resistor, The Potentiometer and the Rheostat, Resistor Wattage Rating, Resistor Color codes