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Phys 272
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Phys 272

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  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)