5D10  Resistance Characteristics
            .10 Resistor Assortment
            .40 Resistance Model
            .42 Electrons in Wire Models
5D20  Resistivity and Temperature
            .10 Resistance at Low Temperature
            .30 Carbon Filament Lamp
            .34 Lightbulbs vs Resistors
5D30  Conduction in Solution
5D40  Conduction in Gases
            .10 Jacob's Ladder