1. Electricity and Magnetism
Physics 208
Dr. Tatiana Erukhimova
Lectures

2. Current, Ohm’s Law, Etc.

3. The Continuity Equation for Steady State Currents
Currents and current densities are constant in time – steady state. The flux of out of any closed surface must be zero.

4. For steady state situation
Kirchhoff’s junction rule: The algebraic sum of the currents into any junction is zero.
Kirchhoff’s loop rule: The algebraic sum of the potential differences in any loop must be zero.

5. Resistors in series:
Resistors in parallel:

6. Circuits with capacitors

7. Circuit with capacitors

8. Drift velocity

9. Joule’s Law

10. Why does a light bulb burn out when you switch the light on and never when you turn it off?