# Phys 272 - PowerPoint PPT Presentation

Phys 272

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Phys 272

## Phys 272

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##### Presentation Transcript

1. Phys 272 Alternating Current

2. A.C. Versus D.C

3. (Natural) Frequency, Period, etc…

4. Alternating Current

5. Voltage and Current US: 120V rms, 60Hz Europe: 230V rms, 50Hz

6. Question

7. Question

8. Resistive AC circuit

9. Capacitive AC circuit

10. Capacitive Reactance

11. Inductive AC circuit

12. Inductive Reactance

13. RLC

14. RLC Circuit and Impedance

15. Summary:Reactance and Impedance

16. RLC Circuit and Impedance

17. High Pass and Low Pass Filter

18. Resonance

19. Resonance Happens when driving frequency equals natural frequency

20. Find XL and XR at resonance

21. Root-mean-square

22. Power and rms

23. More rms

24. Transformer

25. Reducing current during transmission

26. Saving energy, why?

27. Solution

28. Complex reactance:A more general “Ohm’s Law”

29. Complex reactance

30. Complex Numbers Review

31. Complex Plane

32. Complex Plane (Special Cases)

33. Translating between Real and Complex Worlds

34. The Process

35. The Rule Replace the voltage by complex version. Use Ohm’s law to find the complex current. Pretending R, L, C are all resistance with complex reactance. The imaginary part of the complex current gives you the real current I(t). The magnitude of the complex current gives you the amplitude of the real current.

36. Capacitive Circuit

37. Inductive Circuit

38. RLC Circuit

39. RLC Circuit

40. RLC Circuit (amplitude)

41. RLC Circuit (full treatment)