2. What would life be like without electricity? Copyright © 2010 Ryan P. Murphy

3. Much different than it is for most of us.

5. Let’s do a quick review of the atom to help us understand electricity…

6. Electrons are negatively chargedElectrons are negatively charged Copyright © 2010 Ryan P. Murphy

7. Electrons are negatively charged Protons (nucleus) are positively charged Copyright © 2010 Ryan P. Murphy

8. Electrons are negatively charged Protons (nucleus) are positively charged Copyright © 2010 Ryan P. Murphy

9. Electrons are negatively charged Protons (nucleus) are positively charged Copyright © 2010 Ryan P. Murphy

10. Electrons are negatively charged Protons (nucleus) are positively charged Their charges are about equal Copyright © 2010 Ryan P. Murphy

11. Electrons are negatively charged Protons (nucleus) are positively charged Add Electrons - Atom becomes more negatively charged (anion). Copyright © 2010 Ryan P. Murphy

12. Electrons are negatively charged Protons (nucleus) are positively charged Take away (strip) electrons - the atom becomes more positively charged (cation). Copyright © 2010 Ryan P. Murphy

13. Annoying Tape. –Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. Make non-stick handles by folding a small amount tape on itself. Copyright © 2010 Ryan P. Murphy

14. Annoying Tape. –Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. Make non-stick handles by folding a small amount tape on itself. –Stick one piece of tape to table. –Stick the other piece of tape on that tape. –Quickly pull tape from table and then apart. –Observe what happens to the tape when it gets close to each other and then eventually your arm. Try and dispose of in trash barrel by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

15. Annoying Tape. –Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. Make non-stick handles by folding a small amount tape on itself. –Stick one piece of tape to table. –Stick the other piece of tape on that tape. –Quickly pull tape from table and then apart. –Observe what happens to the tape when it gets close to each other and then eventually your arm. Try and dispose of in trash can by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

16. What happened?

17. –When you removed the tape from the table you gave it an electrical charge. When you peeled the tape apart from each other, one piece of tape gained more of a charge than the other.

18. What happened? –When you removed the tape from the table you gave it an electrical charge. When you peeled the tape apart from each other, one piece of tape gained more of a charge than the other. Opposite charges attract (+) (-)

19. Annoying Tape. –Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. Make non-stick handles by folding a small amount tape on itself. –Stick both pieces of tape to table. –Quickly pull tape from table. –Observe what happens to the tape when it gets close to each other and then eventually your arm. Try and dispose of in trash barrel by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

20. Annoying Tape. –Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. Make non-stick handles by folding a small amount tape on itself. –Stick both pieces of tape to table. –Quickly pull tape from table. –Observe what happens to the tape when it gets close to each other and then eventually your arm. Try and dispose of in trash can by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

21. What happened?

22. –Each piece of tape gained a negative charge when removed from the table. When they were brought close together they moved away from each other.

23. What happened? –Each piece of tape gained a negative charge when removed from the table. When they were brought close together they moved away from each other. Like charges repel. (-) (-)

24. Copyright © 2010 Ryan P. Murphy

25. Opposite charges attract. Opposite charges attract. Copyright © 2010 Ryan P. Murphy

26. Opposite charges attract. Opposite charges attract. Copyright © 2010 Ryan P. Murphy

27. The Same forces repel. The Same forces repel. Copyright © 2010 Ryan P. Murphy

28. The Same forces repel. The Same forces repel. Copyright © 2010 Ryan P. Murphy

29. Which one is right and which is wrong? Copyright © 2010 Ryan P. Murphy

30. Which one is right and which is wrong? Answer: They are both wrong. Copyright © 2010 Ryan P. Murphy

31. Which one is right and which is wrong? Answer: They are both wrong. Copyright © 2010 Ryan P. Murphy

32. Which one is right and which is wrong? Answer: They are both wrong. Copyright © 2010 Ryan P. Murphy

33. Which one is right and which is wrong? Answer: They are both wrong. Copyright © 2010 Ryan P. Murphy

34. Which one is right and which is wrong? Answer: They are both wrong. Copyright © 2010 Ryan P. Murphy

35. Which one is right and which is wrong? Answer: They are both wrong. Copyright © 2010 Ryan P. Murphy

36. Which one is right and which is wrong? Answer: Now they’re both right. Copyright © 2010 Ryan P. Murphy

44. Conductor: Material that allows electric charges to move freelyMaterial that allows electric charges to move freely Metals are good conductorsMetals are good conductors Insulator: Material that does not allow electric charges to move freelyMaterial that does not allow electric charges to move freely Plastic is a good insulatorPlastic is a good insulator

45. Charging by Induction:Charging by Induction: Electrons in the object move away or towards another charged object is placed close to it

46. How do objects become charged? Charging by Contact: Electrons get passed from one object to the other when they touch

47. How do objects become charged? Charging by friction: Electrons get passed from one object to the other when they rub against one another

48. Activity- Bad Hair Day Demonstration. –Rub balloon all around your head. –Question: Why does this happen? Copyright © 2010 Ryan P. Murphy

49. Answer! –Electrons from your body move into the balloon. –This gives you a positive charge. –Your hair is also positive. –Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy

50. Answer! –Electrons from your body move into the balloon. –This gives you a positive charge. –Your hair is also positive. –Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy + + + ? ?

51. Answer! –Electrons from your body move into the balloon. –This gives you a positive charge. –Your hair is also positive. –Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy + + ? ?

52. Answer! –Electrons from your body move into the balloon. –This gives you a positive charge. –Your hair is also positive. –Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy + + +

53. Static Electricity: the imbalance of electric charges either in or on a material.

54. forceCoulombs Law: Any two charged objects will create a force on each other. Opposite charges will produce an attractive force while similar charges will produce a repulsive force.

55. Coulombs Law: Any two charged objects will create a force on each other. Opposite charges will produce an attractive force while similar charges will produce a repulsive force.

59. –Coulombs Law: The greater the charges, the greater the force. (Direct relationship) The greater the distance between them, the smaller the force. (Inverse relationship)

60. Coulombs Law: Any two charged objects will create a force on each other. Opposite charges will produce an attractive force while similar charges will produce a repulsive force. –Coulombs Law: The greater the charges, the greater the force. (Direct) The greater the distance between them, the smaller the force. (Inverse)

61. The electric force at the atomic level is responsible for most of the everyday forces that we observe, such as the force of a spring and the force of friction.

62. Electric force doesn’t require objects touch. An electric field always exists in the space around a charged particle. Any other charged particle in that field will experience an electric force.