1. Ohm’s Law and Resistivity

2. Current “Flow” of charges per second
Actual speed of an electron is called the “drift speed”

3. Conceptual Current E

4. Current Equation

5. Conductivity and Resistivity
The ability of a material to conduct charges is measured by σ which is the conductivity.
The inverse of conductivity is ρ which is the resistivity. The unit of resistivity is the Ω·m.

6. Ohm’s Law
Many materials exhibit a linear relationship between I and V for a given R. Such materials are referred to as “ohmic” and follow the equation:

7. Ohmic
Non-ohmic V V
slope = R I I

8. Resistance and Temperature
Resistance of a conductor directly related to Temperature

9. R vs T (normal conductor)

10. R vs T (Superconductor)TC

12. Meissner Effect

14. Lexus Hoverboard