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Reminder: Exam I coming up Feb 24 th !

Reminder: Exam I coming up Feb 24 th !. HW3 due on Friday 21 th . “review” thing next time. I made a mistake …. The Exam: 5 Multi-choice questions ( 10 pts / ec ) 50 pts 1 or 2 Bonus M.C. questions (5pts/ ec ) 2 Written-out problems 50 pts Total 100 pts.

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Reminder: Exam I coming up Feb 24 th !

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  1. Reminder:Exam Icoming up Feb 24th! HW3 due on Friday 21th . “review” thing next time I made a mistake ….

  2. The Exam: 5 Multi-choice questions (10pts/ec) 50 pts 1 or 2 Bonus M.C. questions (5pts/ec) 2 Written-out problems 50 pts Total 100 pts

  3. Example: 18.30 A 115-V fish-tank heater is rated at 110 W. Calculate a) the current through the heater when it’s operating, and b) its resistance.

  4. Mystery box

  5. Mystery box

  6. Mystery box

  7. V V

  8. Mystery box

  9. Mystery box V(t) V t

  10. V(t) V V t

  11. The point: Voltage sources can vary with time! Special case is sinusoidal sources: AC sources

  12. AC Current: time varying voltage

  13. AC current!

  14. AC current!

  15. AC current!

  16. AC current!

  17. AC current!

  18. AC current!

  19. AC current!

  20. AC current!

  21. AC current!

  22. AC current!

  23. AC current!

  24. AC current!

  25. AC current!

  26. AC current!

  27. AC current!

  28. AC current!

  29. AC current!

  30. AC current!

  31. AC current!

  32. AC current!

  33. AC current!

  34. AC current! STOP!

  35. Measuring the average of AC values: +V0 0 -V0

  36. +1 0 Ave = 0 -1 +1 Ave = ½ 0 -1

  37. Measuring the average of AC values: RMS averaging 0 likewise

  38. Ohm’s Law Peak sense Averaged sense

  39. Example: House voltage is nominally 110 VRMS. What‘s the peak voltage?

  40. Example: Suppose I stick an 100  resistor into a wall outlet. What peak and RMS currents will flow?

  41. Measuring the average Power: 0

  42. Peak power Average power

  43. Example: What’s the average power my 100  resistor of previous example must be able to dissipate so as to not burn up? What’s the peak power?

  44. Example: A current of 2.20 ARMS flows through a 100 W resistor. What is the average power the resistor must dissipate?

  45. Review problem: A What’s the electric field here? (figure on next page)

  46. Review problem: A

  47. Review problem: B What’s the electric potential here? (figure on next page)

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