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Lecture: 25 (iq22) Ch20 Circuit elements

1. Capacitor and capacitance:

a. Spherical capacitor: large r, s<<r limit

b. One sphere capacitor

2. Energy density: Fill the gap with dielectric medium. E’=E/K.

a. Case 1: Fixed Q case

b. Case 2: Fixed V case. (see the figure)

3. RC circuit: Charging case.

4. An exercise which involves a one capacitor system and a connected two capacitor system.

5. Ohm’s law, and power dissipated in a resistor.

6. An exercise on Ohm’s laws.