1. ELL100: INTRODUCTION TO ELECTRICAL ENGG.
Lecture 8
Course Instructors:
J.-B. Seo, S. Srirangarajan, S.-D. Roy, and S. Janardhanan
Department of Electrical Engineering, IITD

2. Response to a forcing function

3. Response to a forcing function

4. Response to a forcing function

5. Impedance the ratio of voltage to current for exponential waveform
extends the concept of resistance to AC circuits
a complex number; units same as resistance (Ohms)
It has both magnitude and phase; unlike resistance, which has only magnitude.

6. Impedance the ratio of voltage to current for exponential waveform
extends the concept of resistance to AC circuits
a complex number; units same as resistance (Ohms)
It has both magnitude and phase; unlike resistance, which has only magnitude.

7. Impedance

8. Impedance

9. Impedance

10. Impedance

11. Impedance

12. Impedance

13. Impedance

14. Example

15. Example

16. Example

17. Example

18. Representation of Sinusoids by exponential

19. Representation of Sinusoids by exponential

20. Phasor representation
Express in terms of Effective/RMS value
Phasor:

21. Phasor representation
Express in terms of Effective/RMS value
Phasor:

22. Phasor representation
Express in terms of Effective/RMS value
Phasor:

23. Phasor representation
Write down the equation of the current shown below as a function of time
Represent the current by phasor
The current reaches a positive maximum of 10 (A) at

24. Phasor representation
Write down the equation of the current shown below as a function of time
Represent the current by phasor
The current reaches a positive maximum of 10 (A) at

25. Phasor representation
Write down the equation of the current shown below as a function of time
Represent the current by phasor
The current reaches a positive maximum of 10 (A) at

26. Phasor representation
Write down the equation of the current shown below as a function of time
Represent the current by phasor
The current reaches a positive maximum of 10 (A) at

27. Example

28. Example 

29. Example  

30. Example  

31. Example

32. Example

33. Impedance & Phasor representation

34. Impedance & Phasor representation

35. Impedance & Phasor representation

36. Impedance & Phasor representation

37. Impedance & Phasor representation

38. Impedance & Phasor representation

39. Impedance & Phasor representation

40. Impedance & Phasor representation

41. Impedance & Phasor representation

42. Impedance & Phasor representation

43. Impedance & Phasor representation

44. Impedance & Phasor representation

45. Impedance