Electric Fields

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Electric Fields - PowerPoint PPT Presentation

Electric Fields. Learning Goal. Know the convention related to the direction of a vector representing the ELECTRIC FIELD around charged particles. Know the difference between ELECTRIC POTENTIAL and ELECTRIC POTENTIAL ENERGY Know what VOLTAGE is. GRAVITY. ELECTROSTATIC FORCE. -. -. -.

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Electric Fields

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Presentation Transcript
1. Electric Fields

2. Learning Goal Know the convention related to thedirection of a vector representing the ELECTRIC FIELD around charged particles. Know the difference betweenELECTRIC POTENTIALandELECTRIC POTENTIAL ENERGY Know what VOLTAGE is.

3. GRAVITY ELECTROSTATIC FORCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Distance = 1 R 2 R 3 R 4 R FORCE = 1 N 1/4 N 1/9 N 1/16 N

4. Field lines are in the direction of the force that would be put on a POSITIVE test charge. - +

5. Field lines are in the direction of the force that would be put on a POSITIVE test charge. + +

6. Field lines are in the direction of the force that would be put on a POSITIVE test charge. Test Charge ? + Force What is the direction of the field lines around the unknown charge?

7. - + http://son.nasa.gov/tass/images/electric_fields3.jpg

8. + http://son.nasa.gov/tass/images/electric_fields3.jpg

9. + - http://son.nasa.gov/tass/images/electric_fields3.jpg

10. + +

11. - -

12. + + + + + + + + + + + - - - - - - - - - - - http://son.nasa.gov/tass/images/electric_fields3.jpg

14. + + http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/estatics/u8l4c16.gif

15. Electrical Field ½ g 1 g 0 g 1 g ½ g - - - - - - - - - - - - - - - - Gravitational Field -

16. Charges arrange themselves on the surface to create an electrical field of zero on the inside. - - - - - - - - - - - - - - - - - - - - - - - -

17. + + - + - - - - + - - + - - + - - + - - + - - + - - + - - + - - - - - + +

18. - - - - - - - The amount a charge that can be built up before discharge is directly proportional to the radius of the sphere.

19. Charges arrange themselves on the surface to create an electrical field of zero on the inside. q1· q2R2 F = k - - - - - - - - - - - - - - - - - - - Greater DISTANCEneeds More CHARGE - - - - - - - - - - - - -

20. Charges arrange themselves on the surface to create an electrical field of zero on the inside. - - - - - - - - - - - - - - - q1· q2R2 - - - F = k - - Greater DISTANCEneeds More CHARGE

21. - - - - + + - + + + + + + + - + + + + + + + + + + - + + - - - - -

22. - - - - - - - -

23. The sharp points of the nails leak off charge just about as fast as it is being put on.

25. + + + + + + + + + + + + - - - - - - - - - - - - http://www.roseappleacres.com/aboutus/index.htm - - - - - - - - - - - - - - - - - - - - - - - - - -

26. Capacitors

28. + + + + + + + + + + + + + + + + Capacitor + + + + + + + + + + + + + + + + + + + + + + + + + + + + - + + - - - - - - - - - - - - - - + + + + + + + + + + + + + + + - + + + + + + + + + + + + + + - - - - - - - - - - - - - - + - - + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - + - - + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - + - + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://www.sears.com/sr/automotive/diehard_brand.jsp?vertical=AUTO

29. Capacitor Insulator Conductor Insulator Conductor

30. Capacitor http://www.splung.com/fields/images/capacitors/capacitors.jpg

31. Leyden Jar(capacitor) - - - - - - - - - - - - - - + + - - - + + - - - + + - - - + - + - - - - + + - - + + - - + + - + - + - - + - - + + + + + + + + +

32. ELECTRICALPotentialEnergy Versus ELECTRICALPotential

33. The WORK done in lifting the crate equalsthe amount of Gravitational Potential ENERGY the crate will now have, which equals the amount of WORK the crate can do when released. 15 meters 2,000 N http://www.aviationpics.de/prev/crane%203.jpg

34. GRAVITATIONALPotential Energy SeparatingAttractive Bodies ELECTRICALPotential Energy Bringing TogetherRepulsive Bodies 2,000 N (Joules) (Joules)

35. ELECTRICALPotentialEnergy ELECTRICALPotential Total amountof energy Total amountof energyfor EACHcoulomb of charge (Joules/Coulomb) (Joules) VOLTS

36. “9 Volts” ELECTRICALPotential Energy Bringing TogetherRepulsive Bodies(Joules / Coulomb) 9 V It takes 9 Joules of Energy for every Coulomb of charge that is brought together. “VOLTS” 9 Joules of Energy are released for every Coulomb of charge that flows through a wire.

37. 60Joules 60 Joules 120 Joules 120 Joules 120 Joules JoulesCoulomb 120 120 Volts

38. Low Voltage High Voltage One Coulomb One Coulomb

39. 10 Volts 10 Volts 40 Joules 10 Joules 10 J 10 J 10 J 10 J 10 J One Coulomb Four Coulombs

40. Many moreCoulombs, 6 Volts http://media.rei.com/media/603559Prd.jpg MoreJoulesperCoulomb many moreJoules More VOLTS A little lessjoules per coulomb 9 Volts http://www.maxiaids.com/ProdImages/4556718.jpg

41. High Voltage High Voltage Four Coulombs One Coulomb

42. Low Voltage High Voltage One Coulomb One Coulomb