1. RC Circuits

2. Capacitor in DC
No current flows through a capacitor in DC (I constant)

3. Charging and discharging a Capacitor
1.-When the direction of the current flow is toward the positive plate of a capacitor, then
2. When the direction of current flow is away from the positive plate of a capacitor, then

4. Charging a Capacitor (1)
What happens when we close switch S?

5. Charging a Capacitor (2)
I becomes almost zero after some time
Q becomes after some time
Time constant

6. Charging a Capacitor (3)

7. Discharging a Capacitor (1)
What happens when we close switch S?

8. Discharging a Capacitor (2)
I becomes zero after some time
Q becomes zero after some time
Time constant

9. Discharging a Capacitor (3)