1. Plan for Today (AP Physics I)
Go over review problems
Go over complex circuits worksheet
In-class review

2. Calculate the potential difference at a point in space
Due to one or more point charges
V = kq/r
Then you can add them up if you have multiple charges (remember, voltage is scalar, but may have signs)
In a uniform electric field
V = Ed, V = PE/q

3. Calculate the electric potential energy
Due to one or more point charges
PE = -kq1q2/r2
In a uniform electric field
PE = -qEd
Think about what signs mean
Also be able to relate to other energies (like KE)

4. Parallel Plate Capacitors
Their basic structure
What a dielectric does
Equation C = q/V

5. Types of Problem Calculate the capacitance given area and distance
Calculate the capacitance given the charge and voltage
Calculate with a dielectric constant

6. Capacitors in series and parallel circuits
Q’s are all equal
Vs add
Vs are all equal
Qs add

7. Parallel vs. Series
Which would have the greatest equivalent capacitance?
Parallel
Why?
Least?
Series
Complex circuits (series and parallel)

8. Types of Problems Complex circuits – calculate equivalent capacitance
Complex circuits – calculate qs and vs on each capacitor
In series and parallel, calculate vs and qs on each capacitor

9. Dielectric constant Know how a dielectric works
Know how to apply these to the capacitance equation
What it does for capacitance

10. Types of problems Calculate capacitance given a k
Explain how dielectrics work

11. Energy stored in a capacitor

12. Types of Problem
Find the potential energy of a system given 2 of the following: charge, capacitance, or voltage

13. Example 1
A 5 uC charge is .6 m away from a 8 uC charge. Find the potential difference at a point halfway between them.

14. Example 2
An electron is moved between two parallel plates with an electric field of strength 300 N/C a distance of 2 mm.
What is the potential difference between the plates?
What is the potential energy of the charge?
What is the velocity of the electron when it is moved from the negative plate to the positive plate?

15. Example 3
A capacitor has an area of 15 square centimeters. The plates are separated by .5 mm. What is its capacitance?
What would the capacitance be if water was plates between the plates (dielectric constant of 80)?

16. Example 4
Calculate the equivalent capacitance for the following circuit

17. Example 5
Calculate the charge and voltage on each capacitor in the following circuit

18. Example 1
A 5 uC charge is .6 m away from a 8 uC charge. Find the potential difference at a point halfway between them.

19. Example 2
An electron is moved between two parallel plates with an electric field of strength 300 N/C a distance of 2 mm.
What is the potential difference between the plates?
What is the potential energy of the charge?
What is the velocity of the electron when it is moved from the negative plate to the positive plate?

20. Example 3
A capacitor has an area of 15 square centimeters. The plates are separated by .5 mm. What is its capacitance?
What would the capacitance be if water was plates between the plates (dielectric constant of 80)?

21. Example 4
Calculate the equivalent capacitance for the following circuit

22. Example 5
Calculate the charge and voltage on each capacitor in the following circuit