Chapter 24 Capacitance, dielectrics and electric energy storage

Chapter 24 Capacitance, dielectrics and electric energy storage PowerPoint PPT Presentation


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Parallel Plate Capacitor. . . . Fig 26-4b, p.800. Active Figure 26.4. (SLIDESHOW MODE ONLY). Potential difference and electric fields in a uniform electric field. a. b. . d. Potential difference and electric fields in a uniform electric field. a. b. . d. The constant of proportionality is called

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Chapter 24 Capacitance, dielectrics and electric energy storage

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1. Chapter 24 Capacitance, dielectrics and electric energy storage Basic circuit devices Resistors Capacitors Inductors Power supply (Battery, Generator) Use our knowledge of electric fields, potentials, and energy to describe how capacitors work.

2. Parallel Plate Capacitor

3. Active Figure 26.4 (b) When the switch is closed, the battery establishes an electric field in the wire that causes electrons to move from the left plate into the wire and into the right plate from the wire. As a result, a separation of charge exists on the plates, which represents an increase in electric potential energy of the system of the circuit. This energy in the system has been transformed from chemical energy in the battery. Active Figure 26.4 (b) When the switch is closed, the battery establishes an electric field in the wire that causes electrons to move from the left plate into the wire and into the right plate from the wire. As a result, a separation of charge exists on the plates, which represents an increase in electric potential energy of the system of the circuit. This energy in the system has been transformed from chemical energy in the battery.

5. Potential difference and electric fields in a uniform electric field

6. Potential difference and electric fields in a uniform electric field

7. Factors affecting capacitance Size of the capacitor (A, d) Geometric arrangement Plates Cylinders Material between conductors Air Paper Wax

8. Units of capacitance

9. Capacitance – Isolated Sphere Assume a spherical charged conductor Assume V = 0 at infinity Note, this is independent of the charge and the potential difference

10. Cylindrical capacitor

11. Capacitance of a cylindrical capacitor

12. Example How strong is the electric field between the plates of a 0.80 mF air gap capacitor if they are 2.0 mm apart and each has a charge of 72 mC?

13. Capacitors in Parallel

14. Capacitors in Series

15. Capacitor circuit example

16. Energy Storage in Capacitors

17. Alternate Energy Expressions

18. Energy Density

19. Dielectrics

20. Dielectrics

21. Example values of dielectric constant

22. Effect of a dielectric on capacitance

23. Effect of the dielectric constant

24. Example – Parallel Plate Capacitor

25. Dipoles

26. Dipoles in a Uniform Electric Field

27. Work Rotating a Dipole in an Uniform Electric Field

28. Example P26.9

29. Example P26.21

30. Example P26.27

31. Example P26.35

32. Example P26.43

33. Example P26.59

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