1. Magnetism

2. Observe: SNSN Attract or repel?

3. Observe: SNSN Attract or repel?

4. Observe: SN SN Attract or repel?

5. Observe: SN SN Attract or repel?

6. Observe: SN

7. SN Make a map of the magnetic field around the bar magnet

9. N S Make a map of the magnetic field around the horseshoe magnet

10. Try this.

11. What does the current in the wire do?

12. The magnetic field, B N S B

13. A current makes a magnetic field I B

14. I B I B This is called the right hand rule

15. Fields If you put a ______ in a __________ field, it will experience a force.

16. Fields If you put a ______ in a __________ field, it will experience a force. If you put a mass in a gravitational field, it will experience a force.

17. Fields If you put a ______ in a __________ field, it will experience a force. If you put a mass in a gravitational field, it will experience a force. If you put a charge in an electrical field, it will experience a force.

18. Fields If you put a ______ in a __________ field, it will experience a force. If you put a mass in a gravitational field, it will experience a force. If you put a charge in an electrical field, it will experience a force. If you put a magnet in a magnetic field, it will experience a force.

19. Oddly enough… Electrical and magnetic fields can attract and repel. Gravitational fields seem to only attract

20. The relationship between electricity and magnetism A moving charge affects a magnet A moving magnet affects a charge

21. The relationship between electricity and magnetism A moving charge affects a magnet … it makes a magnetic field A moving magnet affects a charge … it makes an electrical field

22. The relationship between electricity and magnetism A moving charge affects a magnet … it makes a magnetic field A moving magnet affects a charge … it makes an electrical field There is an application of the right hand rule for each of these

23. The relationship between electricity and magnetism A stable magnetic field affects a charge… A stable electrical field affects a magnet…

24. The relationship between electricity and magnetism A stable magnetic field affects a charge… … only if the charge is moving A stable electrical field affects a magnet… …only if the magnet is moving

25. The relationship between electricity and magnetism A stable magnetic field affects a charge… … only if the charge is moving A stable electrical field affects a magnet… …only if the magnet is moving There is an application of the right hand rule for each of these

26. Electromagnets A coil of wire, carrying a current makes a magnetic field. If you put the coil around a piece of iron or steel, it becomes an electromagnet.

27. Electromagnets A coil of wire, carrying a current makes a magnetic field. If you put the coil around a piece of iron or steel, it becomes an electromagnet. Where could you use an electromagnet?

33. Solenoid If a magnet can move into and out of the coil, it is called a solenoid.

34. Solenoid If a magnet can move into and out of the coil, it is called a solenoid. Where could you use a solenoid?

35. Electric motors An electric motor converts electrical energy into work, usually rotational motion. Usually, a magnet makes coil of wire rotate when a current is flowing.

36. Which direction is the force on the wire?

37. Use the right hand rule !

38. B = the magnetic field =index finger I = the (+) current =thumb F = force on the wire =palm

39. B = the magnetic field =index finger I = the (+) current =thumb F = force on the wire =palm

40. What is the missing vector ? I B

41. I B

42. Motors --Convert electrical energy into mechanical energy --An electric current causes a coil of wire to spin in a magnetic field --The rotational motion can do many jobs Mechanical Energy  Electrical Energy

43. Generators --Convert mechanical energy into electrical energy --A coil of wire spinning in a magnetic field causes an electric current --There are many ways to spin the generator Mechanical Energy  Electrical Energy

44. Motors --Convert electrical energy into mechanical energy --An electric current causes a coil of wire to spin in a magnetic field --The rotational motion can do many jobs Generators --Convert mechanical energy into electrical energy --A coil of wire spinning in a magnetic field causes an electric current --There are many ways to spin the generator Mechanical Energy  Electrical Energy

45. 123456123456

46. Generator: If you move the wire, the force is exerted on the charge Motor: If you move the charge (a current), the force is exerted on the wire B B I Force EMF Mechanical Energy  Electrical Energy

47. B = the magnetic field =index finger v = velocity of moving wire =thumb EMF = force on the charge =palm

48. What is the missing vector ? v B

49. v B

50. v EMF