1. Physics 121 Lecture Summaries Contents: – 9/21/2008 Lecture 1Introduction to Fields Lecture 2Electric Charge Lecture 3Electric Field Lecture 4Gauss’s Law Lecture 5Electrostatic Potential Lecture 6Capacitance Lecture 7Resistance and Resistivity, Circuits Part 1 Lecture 8DC Circuits, Part 2 Lecture 9Magnetic Fields Lecture 10Magnetic Fields from Currents Lecture 11Induction I – Faraday’s Law Lecture 12Induction II – LR Circuits Lecture 13LCR and AC Circuits, Oscillations SummaryPhase Relations in AC Circuits

2. Summary: Electric Charge Lecture 2

3. Summary: Electric FieldLecture 3

4. Summary: Gauss’s Law Lecture 4

5. Summary: Electric PotentialLecture 5

6. Summary: CapacitanceLecture 6

7. Summary: Lecture 7 - Resistance and Resistivity

8. Summary – Lecture 7 Resistive Circuits An emf device does work on charges to maintain a potential difference between its output terminals. Kirchhoff’s rules: – Loop rule. The algebraic sum of the changes in potential encountered in a complete traversal of any loop of a circuit must be zero. – Junction rule. The sum of the current entering any junction must be equal to the sum of the currents leaving that junction. Series resistances: when resistances are in series, they have the same current. The equivalent resistance that can replace a series combination of resistance is Parallel resistance: when resistances are in parallel, they have the same potential difference. The equivalent resistance that can replace a parallel combination of resistance is, Single loop circuits: the current in a single loop circuit is given by Power: when a real battery of emf and internal resistance r does work on the charges in a current I through the battery,

9. Summary: Lecture 7/8A - Circuits, Part 1

10. Summary: Lecture 8B – RC Circuits, Part 2

11. Summary: Lecture 9 – Magnetic Fields

12. Summary: Lecture 10 – Magnetic Fields from Currents

13. Summary: Lecture 11 – Induction I – Faraday’s Law

14. Summary: Lecture 12 – Induction II – LR Circuits

15. Summary: Lecture 13/14 - LCR & AC Circuits, Oscillations

16. Summary: Phase Relations in AC Circuits