1. Basis of DC Motor Action

2. Magnetic Field Tippler

3. Field of a Permanent Magnet North to south outside the magnet; south to north inside the magnet N S

4. Field of an Electromagnet is similar to that of a permanent magnet N S N S

5. Oersted Experiment Tippler

6. Compass on Top of the Wire shows approximate direction of field as the result of current flowing in the wire

7. Compass on Bottom of Wire for current flowing in the same direction as before

8. Field Around a Current Tippler

9. Field Around Current-Carrying Wire schematically showing the direction of the field around the wire for current flowing in the direction shown in the wire

10. Right Hand Rule From http://micro.magnet.fsu.edu/electromag/electricity/generators /

11. Electromagnet and One Loop shows that the field inside the loop is always in the same direction N S

12. Three-Dimension Demonstration

13. Opposite Poles Attract so if the center magnet is can rotate around its midpoint, it will tend to line up with the two fixed magnets NS N S N S N

14. Momentum Causes Overshoot so the direction of rotation will be reversed by the magnetic attraction NS N S N S N N S NS NSN S

15. And finally stops NS NS N S N S N NS NSN S NSNS

16. Opposite Poles Attract so the center electromagnet rotates N S NS NS N

17. If the direction of the current changes just as the electromagnet passes the fixed magnets, like poles repel causing the electromagnet to continue rotating. NSNS NS NS N S S N S

18. Rotation Continues NSNS NS NS N S N S S N S NSNS

19. The direction of the current can be changed if the ends of the wires brush along the fixed + and – contacts as the electromagnet rotates. + _ brushes rotates stationary

20. Go to motor applet http://www.walter- fendt.delph11e/electricmotor.htmhttp://www.walter- fendt.delph11e/electricmotor.htm