1. Warm-Up: 1. What does it mean for a particle to have a “charge”? 2. When do you observe static electricity?

2. Objects can be charged

3. A charged object exerts a force (a push or a pull) on other charged objects

4. The law of electric charges: like charges repel; opposite charges attract

5. The force between charged objects is called an electric force

6. The strength of the electric force depends on the size of the charges and the distance between two objects

7. An object can gain a charge through several ways. Friction may “wipe” electrons from one object and transfer them to another.

8. Charging by conduction happens when electrons are transferred from one object to another by direct contact.

9. Charging by induction happens without direct contact

10. Conservation of charge: no charge is ever created or destroyed. Electrons simply move from one atom to another.

11. Warm-Up: 1. What subatomic particles move to create an electric charge? 2. What is the force between two charged objects called?

12. Warm-Up: 1. What are the negatively charged particles in a atom called? 2. Like charges _______, opposite charges ________.

13. Electricity is the movement of electrons from atom to atom.

14. The flow of electric charges is called electric current

15. A conductor is a material in which charges move easily

16. An insulator is a material in which charges cannot easily move

17. Static electricity is the buildup of electric charges on an object

18. Electric discharge is the loss of static electricity

20. A lightning rod provides a path for electric charges to travel into the ground

21. Warm-Up: 1. Why are lightning rods made of metal? 2. Why must electrical wires have plastic and metal?

22. Warm-Up: 1. If an object continues to gain more and more electrons, it gains a ________charge. 2. What is the “spark” that you notice when you touch another person or object?

24. A cell provides an electric current by converting chemical energy into electrical energy

25. Resistance is the opposition to the flow of electric charge. Good conductors have low resistance.

26. Poor conductors have high resistance

27. The resistance of a wire is affected by its thickness and length

28. Power = voltage x current or watts (W) = volts (V) x amps (A)

29. 1. A toaster draws 10A of current. All homes in the US receive 120 V at the outlets. What is the power of the toaster? 2. A car uses a 12V batter. One headlight draws 3A. What is the power of the headlight?

30. Warm-Up: 1. A flashlight uses a 1.5V battery and uses 9 watts of power. How many amps does it draw? 2. A fan (plugged into a home in Lawrenceville) uses 480 watts of power. How many amps does it draw?

31. The energy per unit charge is called the potential difference and is expressed in volts (V).

32. Current is the rate at which charge passes through a given point and is measured in amperes or amps (A).

33. A circuit is a pathway through which electric charges flow.

34. A complete circuit has something to use electricity, a source of electrons, and a path.

35. In a series circuit, all parts are connected in a single loop.

36. In a parallel circuit, there is more than one pathway for electrons to follow

37. Warm-Up: 1. Which wire has more resistance? 2. Which type of circuit has more than one pathway for electrons to flow?

38. Warm-Up: 1. Poor conductors have ________ resistance. 2. What is a circuit?

39. The load is the part of a circuit that uses electricity LOAD

40. A switch is used to open and close a circuit. SWITCH

41. A fuse contains a thin strip of metal that melts if the current is too high.

42. A circuit breaker is a switch that automatically opens if the current is too high.

43. Warm-Up: 1. In which kind of circuit are the components connected in a single loop? 2. What is used to open and close a circuit?

44. Illustrated Dictionary: box 1: Name & period box 2: Electric force box 3: Electric current box 4: Static electricity box 5: Static discharge box 6: 3 ways to charge box 7: Parallel circuit box 8: Series circuit

45. Target (#9): 1. What contains a strip of metal that melts if the current is too high in a circuit? 2. What are the three ways charging can happen?

46. Target: For each picture, tell whether it is an example of conduction, induction, friction, or electric discharge:

47. Target: copy these film questions on a separate piece of paper: 1. Electrons flow in a closed path called a ___. 2. _____metal conducts electricity better than____metal. 3. Who figured out how to make electricity? 4. Material that allows electricity to pass through it is a __________.

48. Target 1. What changes chemical energy into electrical energy? 2. Why is there lightning?

49. Create a poster that illustrates the factors that affect resistance: -material -thickness -length -temperature

50. 1. What is the rate at which charge passes through a point? 2. Poor conductors have ________resistance.