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

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. Happens when driving frequency equals natural frequency

20. Find X L and X R 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. Cos and Sin in Complex Number

32. Complex Plane

33. Complex Plane (Special Cases)

34. Finding Imaginary Part

35. Example: Rewrite in Polar Form

36. Finding Imaginary Part

37. Complex Conjugate

38. Conjugate to Modulus

39. Translating between Real and Complex Worlds

40. The Process

41. The Rule 1.Replace the voltage by complex version. 2.Use Ohm’s law to find the complex current. Pretend R, L, C are all resistors with complex reactance. 3.The imaginary part of the complex current gives you the real current I(t). 4.The magnitude of the complex current gives you the amplitude of the real current.

42. Capacitive Circuit

43. Inductive Circuit

44. RLC Circuit

45. RLC Circuit (amplitude)

46. RLC Circuit (full treatment)

47. Impedance and Reactance

48. Complex Number (Phasor)

49. Capacitive Reactance

50. Inductive reactance

51. RLC Circuit and Impedance