1. Electrostatics
Chapter 32

2. 32.1 Electrical forces and Charges
Electrical forces are from atoms
opposites attract & Same repel

3. 32.1 Cont’
The charge of the particles are either positive (protons) or negative (electrons)

4. The atom
Positive center
Electrons are the same#
Neutral Atom

5. 32.3 Coulomb’s Law
States that the relationship between distance and charge will determine the force present.
Unit for charge is the coulomb (C)

6. Coulombs' Law

7. Static Electrons transfer from one object to another.
Remember opposites attract.

8. 32.4 Conductors and Insulators
What is a conductor?
What are some examples of good conductors?
What are some examples of good insulators?

9. Electric Current
Chapter 34

10. Voltage Sources
For charges to flow you need a potential difference and a source for the charge
Can you name a voltage source?
battery, generator

11. Current vs. Voltage Current or charge flows through a circuit
Voltage is the reason why it flows, it does not move
Voltage causes current

12. Analogy for Voltage v. Current

13. 34.4 Electric Resistance
This is how well a conductor works.
Resistance is ability of a conductor to allow a charge to go through
Also thickness or length influence the amount of current allowed

14. 34.5 Ohm’s Law
Ohm is a unit for resistance (Ω)
Ampere is a unit for current (AMP)

15. 34.6 Ohm’s Law and Electric Shock
Your ability to get shocked depends on your condition to a certain extent.

16. Electrocuted! People die from 120V charges every year
Electricity disrupts normal nerve function
Also it damages tissues

17. Electric Shock cont’ How do birds stand on wires?
What is the third prong on a plug for?

18. 34.11 Electric Power
The rate that electrical energy is converted to another form of energy.
Electric power= current X voltage Or
1 Watt=1 amp X 1 volt

19. Types of electric current
DC Direct current - current travels in one path. Voltage source is a battery
AC Alternating current – current that repeatedly reverses direction, twice each cycle. Voltage source is a generator

20. Electric Circuits
Chapter 35

21. 35.2 Electric Circuits A circuit is a path that electricity can flow
What 3 things must all circuits have:
1. resistance/load
2. conductor/wire
3. voltage source/potential difference/ generator or battery
There can be no gaps or breaks

22. 35.3 Series Circuits
In a series circuit The current flows through a number of things in one path.

23. Series Circuits Requirements
1. Current has one path
2. There is resistance from each device on the line.
3. It abides by Ohm’s Law

24. Series Requirements Cont’
4. Each device abides by Ohm’s Law
5. Total voltage in each device adds up to the total voltage of circuit.

25. What does a book series have in common with a series circuit?

26. Series Disadvantage
One thing goes out… they all go out.
Winter Lights

27. 35.4 Parallel Circuits
Each device on the circuit has its own path and then they connect at two points

28. Parallel Circuit Requirement
1. each device connects to the same two points
2. Ohm’s law applies separately to each branch

29. Parallel Requirements cont’
3. total current= sum of currents in parallel branches
4. as # of parallel branches increase total current through battery increases.
5. Voltage is the same in each branch

30. All Circuits
2 types of SAFTY DEVICES built into circuit for protection:
Circuit breaker & fuse
There purpose is to maintain safe amount of current flowing through circuit

31. 35.5 Schematic Diagrams
Is a way to write a circuit on paper.

32. 35.5 Schematic Diagrams

33. Schematic Diagrams