# EC1010: Electrical and Magnetic Circuits(Jan.-May 2012)

These lectures are available on the web for the benefit of students at IIT Madras and elsewhere. Copyrights to these rest solely with the instructor and IIT Madras. Copying them, publishing them, rehosting them on other servers, or using them for any sort of commercial gain is prohibited.

## Instructor: Nagendra Krishnapura

This is a course on circuit analysis. Problem sets and other instructions can be found here. Familiarity with basic calculus is assumed. At IIT Madras, this is a prerequisite course for Networks and Systems and Analog Circuits.

The lectures are also available in iPod format(320×240 video, AAC audio). Click on the link marked iPod next to each lecture to download these.

### Lectures

1. 2012-01-02: Introduction to the course
2. 2012-01-03(iPod): Current and Voltage; Kirchhoff's Current and Voltage laws
3. 2012-01-05(iPod): Electrical circuit elements: Voltage and current sources; R, C, L, M
4. 2012-01-06(iPod): Elements in series and parallel; Superposition in linear circuits
5. 2012-01-09(iPod): Controlled sources; Energy and power in elements; Energy in a mutual inductor and constraint on mutual inductance
6. 2012-01-10(iPod): Nodal analysis of a network with conductances and current sources; Setting up the equations; Conductance matrix; Superposition
7. 2012-01-11(iPod): Nodal analysis with voltage sources and controlled sources; Modified nodal analysis
8. 2012-01-12(iPod): Modified nodal analysis with controlled sources; Loop analysis
9. 2012-01-13(iPod): Loop analysis with link currents as variables; Loop analysis for planar circuits(Mesh analysis) with mesh currents as variables
10. 2012-01-17(iPod): Substitution theorem; Thevenin's theorem
11. 2012-01-23(iPod): Thevenin's theorem; Norton's theorem; Pushing a voltage source through a node; Splitting a current source; Tellegen's theorem
12. 2012-01-24(iPod): Tellegen's theorem; Reciprocity theorem
13. 2012-01-25(iPod): Compensation theorem; Maximum power transfer theorem; Circuits with nonlinear components
14. 2012-01-31(iPod): Two port parameters
15. 2012-02-02(iPod): Negative feedback
16. 2012-02-03(iPod): Opamp for realizing negative feedback circuits; Determining opamp signs for negative feedback
17. 2012-02-06(iPod): Determining opamp signs for negative feedback; Circuits using opamps
18. 2012-02-07(iPod): Opamp amplifiers; Two port representations(cont'd); RC circuit natural response; First order differential equation
19. 2012-02-09(iPod): Step response of RC circuits; Response of a first order circuit to exp(st)
20. 2012-02-10(iPod): Sinusoidal steady response of RC circuits; RL circuits
21. 2012-02-14(iPod): Step response of RC/RL circuits
22. 2012-02-16(iPod): Series RLC circuit; Second order differential equation; Natural response
23. 2012-02-17(iPod): Second order system natural response and step response; AC signal measures; Sinusoidal steady state analysis
24. 2012-02-21: Quiz II discussion
25. 2012-02-23: Quiz II review
26. 2012-02-28(iPod): Sinusoidal steady state analysis; Phasors
27. 2012-02-29(iPod): Sinusoidal steady state response of first order(RC) and second order(series RLC) circuits
28. 2012-03-01(iPod): Series and parallel RLC circuits; Concept of complex power
29. 2012-03-02(iPod): Complex power, Apparent power, Reactive power, Power factor, Power factor correction; Conjugate matching for maximum power transfer
30. 2012-03-05(iPod): Locus diagrams
31. 2012-03-09(iPod): Active and reactive power; Introduction to three phase supply
32. 2012-03-13(iPod): Coupled inductors; Ideal transformer
33. 2012-03-15(iPod): Three phase circuits; Star to Delta transformation; Real and reactive power with a balanced three phase load
34. 2012-03-16(iPod): Symmetrical component representation of unbalanced three phase components; Power measurement
35. 2012-03-20(iPod): Two wattmeter method for three phase power measurement; Magnetic circuits-Basics of magnetic field, MMF and flux
36. 2012-03-22(iPod): Flux density in a single loop; Solenoid; Solenoid with a ferromagnetic core
37. 2012-03-26(iPod): Magnetic circuits with loops of ferromagnetic material; Inductance of a coil with a ferromagnetic core loop; Core nonlinearity, hysteresis
38. 2012-03-27(iPod): Magnetic circuits; Transformer with a ferromagnetic core; Hysteresis loss
39. 2012-03-29(iPod): Eddy current loss and its minimization; Magnetic circuits miscellania
40. 2012-03-30(iPod): Switched capacitor as a resistor; Obtaining a dc voltage from another dc source
41. 2012-03-31: DC-DC buck converter (no recording)
42. 2012-04-10(iPod): DC-DC buck converter; Output voltage ripple
43. 2012-04-17: Quiz IV discussion; Course summary

### Quizzes

1. 2012-01-30: Quiz I
2. 2012-02-20: Quiz II
3. 2012-03-12: Quiz III
4. 2012-04-16: Quiz IV