Introduction to Electrical Engineering (ELL101)

Instructors: Sumantra Dutta Roy (Coordinator), Seshan Srirangarajan, Sandeep Kumar, Mustafijur Rahman, Tanmoy Chakraborty

This page houses the part to be covered in Module 2: Power Applications and Electromagnetics by the first instructor above (Sumantra).
WhatsApp group for the course [Link]

General Information

This is the first-level basic course on an introduction to Electrical Engineering

Credits: 4 (LTP: 3-1-0) [Slot AF]

Schedule for Classes:

Tuesday
03:30pm-04:30pm
LH-111, LH-325 (Lecture Hall Complex)
Wednesday
03:30pm-04:30pm
LH-111, LH-325 (Lecture Hall Complex)
Friday
03:30pm-04:30pm
LH-111, LH-325 (Lecture Hall Complex)

Schedule for Tutorials:

Everyday, 08:00am-09:00am
Mon
Tue
Wed
Thu
Fri
LH-313.1
G03, G04
G05, G06
G07, G08
G09, G10
G01, G02
LH-313.5
G13, G14
G15, G16
G17, G18
G19, G20
G11, G12

Schedule for Practicals:

Everyday, 09:00am-11:00am; 11:00am-01:00pm

Schedule for Examinations:

Mid-Term 1 Examination: 03 Sep (Sunday): 10:00am-11:00am
Groups 01-04: LH-108, Groups 05-08: LH-111, Groups 09-12: LH-114, Groups 13-20: LH-121

Mid-Term 2 Examination: 21 Oct (Saturday): 09:00am-10:00am
Groups 01-04: LH-108, Groups 05-08: LH-111, Groups 09-12: LH-114, Groups 13-20: LH-121

End-Term Examination: 23 Nov (Thursday): 01:00pm-03:00pm
LH-108, LH-111, LH-114, LH-121, LH-308, LH-310, LH-316, LH-325
(Please login to https://exam.iitd.ac.in for your exact room number and seat number, which will appear 12 hour prior to the start of the examination) Re-End-Term Examination: 03 Jan (Wednesday): 05:30pm-07:30pm
VI-LT2

Books, Papers and other Documentation

Textbook:

Lecture Schedule, Links to Material

Date-wise overall schedule of lectures for all instructors: [Link]

In case the MS-Teams forum does not allow access to files, try the following: [Link]

S.No.
Topics
LH-111 Lectures
Instructor
LH-325 Lectures
Instructor
Details
1
Basics of Electromagentics: Grabbing the opportinuty with both hands, left, right, and centre.
01-01
01-01
[Generic scattered references, revision]
Oersted's experiments and Ampere's Swimming Rule.
Application: Schweigger's simple galvanometer.
Maxwell's Right Hand Grip Rule: flux patterns due to a current.
Application: flux patterns due to a circular coil. The arrow notation. Fleming's Left-Hand Rule (Motor Rule). Application: Rotation of a current carrying coil in a magentic field.
Fleming's Right-Hand Rule (Dynamo Rule). Application: Generation of a sinusoidal current in a rotating coil, placed in a magentic field.
01 Aug (Tue) {lecture#M2-LH-111-01}
SDR
19 Aug (Sat) {lecture#M2-LH-325-01}
SDR
MS-Teams:
video_lh_111_01_01aug23_em_intro.mp4, lecture_notes_lh_111_01_01aug23_em_intro.pdf

video_lh_325_01_19aug23_em_intro_phasor1.mp4, lecture_notes_lh_325_01_19aug23_em_intro_phasor1.pdf
2
Representational Basics: Phasors
A man working on a phasor
Got tired of his shaving razor
He thought of another way
But repents to this day
For he used a Laser
02-02
02-02
[Smith and Dorf: Chap 05 Forced Response, Section 5-2 pp.151-156]
Why should a voltage/current/impedance be a complex number when all measurements of physical processes in Mother Nature are real numbers?
Phasors as representational tools for waveforms with the same frequency: representation in terms of the magnitude and phase (when it "starts"). This representation can be in the form of a sinusoidal waveform, or a polar ("phasor") representation, with a magnitude and phase/angle term. This can also be represented in rectangular coordinates as a complex number.
A cosine form is the de facto standard.
Examples. We will use the complex rectangular a + jb form when adding phasors (e.g., impedances in series), and the polar phasor V_eff:angle form when multiplying phasors (e.g., voltage and current, to get the power).
Impedance for pure resistances, inductances and capacitances. The use of differential and integral equations. Applications: examples of household capacitive loads, resistive loads, and the "elephant in the room": inductive ones. Relation with the power factor. To reduce electricity bills.
02 Aug (Wed) {lecture#M2-LH-111-02}
SDR
20 Aug (Sun) {lecture#M2-LH-325-02-03}
[09:00am-11:00am]
An online-only lecture, in place of the following:
22 Aug (Tue) {lecture#M2-LH-325-02}
SDR
MS-Teams:
video_lh_111_02_02aug23_phasor.mp4, lecture_notes_lh_111_02_02aug23_phasor.pdf

video_lh_325_02_03_20aug23_phasor2_power.mp4, lecture_notes_lh_325_02_03_20aug23_phasor2_power.pdf
3
Powerful Practical Concepts
03-03
03-03
[Smith and Dorf: Chap 07 Steady State AC Circuits, Section 7-2 pp.206-214]
Instantaneous power, and its representation in terms of the RMS/effective voltage and current, and the power factor, from the phasor representations of the voltage and current.
A case for AC power, instead of DC power. A toy numerical example to build a case for high voltage across power transmission lines.
04 Aug (Fri) {lecture#M2-LH-111-03}
SDR
20 Aug (Sun) {lecture#M2-LH-325-02-03}
[09:00am-11:00am]
An online-only lecture, in place of the following:
23 Aug (Wed) {lecture#M2-LH-325-03}
SDR
MS-Teams:
video_lh_111_03_04aug23_power.mp4, lecture_notes_lh_111_03_04aug23_power.pdf

video_lh_325_02_03_20aug23_phasor2_power.mp4, lecture_notes_lh_325_02_03_20aug23_phasor2_power.pdf
4
Magnetic Personalities: Attracting Trouble
04-05
04-05
[Smith and Dorf: Chap 20 Magnetic Circuits, Section 20-4 pp.674-681]
Similarities between electric and magnetic circuits. Series and Parallel magnetic circuits. A loaded example of fringing (practical approximations) with an air gap.
08 Aug (Tue) {lecture#M2-LH-111-04}
SDR
25 Aug (Fri) {lecture#M2-LH-325-04}
SDR


MS-Teams:
video_lh_111_04_08aug23_mag1.mp4, lecture_notes_lh_111_04_08aug23_mag1.pdf

video_lh_325_04_25aug23_mag1.mp4 lecture_notes_lh_325_04_25aug23_mag1.pdf


An air gap means more current, but when can an air gap be actually useful? sirf Excel: dAg achhe hain.
Two representative examples of computations related to magnetic circuits, with serial and parallel elements.
More empirical results: reduction in eddy current losses by not using solid cores, but using thin laminated plates.
09 Aug (Wed) {lecture#M2-LH-111-05}
SDR
26 Aug (Sat) {lecture#M2-LH-325-05}
SDR


MS-Teams:
video_lh_111_05_09aug23_mag2.mp4, lecture_notes_lh_111_05_09aug23_mag2.pdf

video_lh_325_05_26aug23_mag2_inductance1.mp4, lecture_notes_lh_325_05_26aug23_mag2_inductance1.pdf


5
Induction Abduction: Confusing Inductances
06-07
05-06
[MS-Teams: slides_magnetic_coupling.pdf]
Self-Inductance and Mutual Inductance. The dot convention.
13 Aug (Sun) {lecture#M2-LH-111-06}
[09:00am-10:00am]
An online-only lecture, in place of the following: 11 Aug (Fri) {lecture#M2-LH-111-06}
SDR
29 Aug (Tue) {lecture#M2-LH-325-06}
SDR


MS-Teams:
video_lh_111_06a_13aug23_inductance1.mp4, video_lh_111_06b_13aug23_inductance1.mp4, lecture_notes_lh_111_06_13aug23_inductance1.pdf

video_lh_325_05_26aug23_mag2_inductance1.mp4 lecture_notes_lh_325_05_26aug23_mag2_inductance1.pdf

video_lh_325_06_29aug23_inductance2_transformers1.mp4, lecture_notes_lh_325_06_29aug23_inductance2_transformers1.pdf


Numerous examples of the dot convention. A simplification for use in complicated circuits: the dependent voltage source, to use for Kirchoff's Voltage Law (KVL) in each loop.
16 Aug (Wed) {lecture#M2-LH-111-07}
SDR
30 Aug (Wed) {lecture#M2-LH-325-07}
SDR


MS-Teams:
video_lh_111_07a_16aug23_inductance2_transformers1.mp4, video_lh_111_07b_16aug23_inductance2_transformers1.mp4, lecture_notes_lh_111_07_16aug23_inductance2_transformers1.pdf

video_lh_325_06_29aug23_inductance2_transformers1.mp4, lecture_notes_lh_325_06_29aug23_inductance2_transformers1.pdf


6
Transformers: Rise of the Beasts
07-08
06-07
[MS-Teams: slides_transformers.pdf]
Introduction to Transformers. Towards building a cicruit model for transformers.
16 Aug (Wed) {lecture#M2-LH-111-07}
SDR
30 Aug (Wed) {lecture#M2-LH-325-07}
SDR


MS-Teams:
video_lh_111_07b_16aug23_inductance2_transformers1.mp4, lecture_notes_lh_111_07_16aug23_inductance2_transformers1.pdf

video_lh_325_06_29aug23_inductance2_transformers1.mp4, lecture_notes_lh_325_06_29aug23_inductance2_transformers1.pdf
video_lh_325_07_30aug23_transformers2.mp4, lecture_notes_lh_325_07_30aug23_transformers2.pdf


Ideal and Non-Ideal Transformers. A common model for non-ideal transformers to account for core (hysteresis, eddy current) losses, magnetising reactance, winding resistances and leakage inductances.
The `reflection' method of creating an `electrically connected' equivalent of a transfer, either looking from the primary side, or the secondary side.
The Open Circuit and Short Circuit tests to determine parameters of a transformer.
18 Aug (Fri) {lecture#M2-LH-111-08}
SDR
01 Sep (Fri) {lecture#M2-LH-325-08}
SDR


MS-Teams:
video_lh_111_08_18aug23_transformers2.mp4, lecture_notes_lh_111_08_18aug23_transformers2.pdf

video_lh_325_08_01sep23_misc.mp4, lecture_notes_lh_325_08_01sep23_misc.pdf



The above list is (obviously!) not exhaustive. Other reference material will be announced in the class. The Web has a vast storehouse of tutorial material on related areas.

Examinations and Grading Information

The marks distribution is as follows (out of a total of 100):
Mid-Term 1 Examination
25
Mid-Term 2 Examination
25
End-Term Examination
50
Grand Total
100

(There may be surprise quizzes held during lectures or tutorials carrying a bonus 5%.)

Attendance Requirements:

As per Institute rules for IIT Delhi students: a minimum of 75%, else one grade less.
Illness policy: illness to be certified by a registered medical practioner.
Attendance in Examinations is Compulsory.

Course Feedback

Link to Course Feedback Form
Sumantra Dutta Roy, Department of Electrical Engineering, IIT Delhi, Hauz Khas,
New Delhi - 110 016, INDIA. sumantra@ee.iitd.ac.in