1. Course Content Worksheet EEC/IQAC/Academic/Form1.1.09-R00
EXCEL ENGINEERING COLLEGE
(Autonomous)
Approved by AICTE, New Delhi & Affiliated to Anna University, Chennai
Accredited by NBA, NAAC with “A+” and Recognised by UGC (2f &12B)
KOMARAPALAYAM - 637303
Department of Electronics and Communication Engineering
Worksheet
Course Code: 20EC101 Course Name: BASICS OF ELECTRICAL ENGINEERING
Sem /Year: I / I Lecture Hour: 50 mins Date:
Unit / Session Title: Unit 1- DC CIRCUITS / Star Delta connection
Course Objective:
Understand the various laws and theorems applied to solve electric
circuits and networks
Specific Objective Familiarize the star to delta conversion method in electrical circuits
Outcome:
Apply basic laws to calculate the voltage, current and power for dc
electric circuit
Teaching Aid: Black board
Notes:
1) Statement / Theorem / Concept
2)Block Diagram/Circuit Diagram/Flowchart/Algorithm
3)Construction/Explanation/Derivation / Advantages/Disadvantages/Application
4)Exercise Equation / Answer
Possible Questions:
16 Marks / 8 Marks / 4 Marks / 2 Marks / 1 Mark
1) 16 Mark
2) 8 Marks
3) 2 Marks
4) 1 Mark – Objective Type
Evaluation Method:
Question – answer
Quiz / MCQ’s
Slip Test
Reading
Seminar
Assignment
Open Book Test
Each concept must be introduced through industrial application
Text book followed : D.P Kothari and I.J Nagrath, “Basic Electrical Engineering”, McGraw Hill
Education India) Private Limited, Fourth Edition,2020.
B.L.Theraja “Fundamentals of electrical Engineering & Electronics”, s. Chand &
Co.Ltd. 2015.
Reference book followed : Rohit Mehta and V.K.Mehta, “Principles of Electrical Engineering and
Electronics”, S.Chand & Co.Ltd., Second Edition, 2015
Website referred : https://www.azdocuments.in/2019/06/basic-electrical.html
Faculty Incharge HoD Director-Academic
2. Course Content Worksheet EEC/IQAC/Academic/Form1.1.09-R00
EXCEL ENGINEERING COLLEGE
(Autonomous)
Approved by AICTE, New Delhi & Affiliated to Anna University, Chennai
Accredited by NBA, NAAC with “A+” and Recognised by UGC (2f &12B)
KOMARAPALAYAM - 637303
Star To Delta Conversion Formula
Star Connection:
Star connection or star network is a network of three ( or more but we consider only three in our
tutorial) electrical components in such a composition such that one point of all the components or
resisters are connected at a common point.
The star connection of Three resistors or branches also looks like the English alphabet “Y” so
sometimes the Star network or connection is also referred to as “Y” or “Wye” connection.
A star or Y connection can also be rearranged to make it look like the English letter “T” and in fact,
many electrical circuits use the star connection in it’s “T” form.
Delta Connection:
Delta connection is an electrical network composed of three branches or circuit components ,
where each branch or element is connected head to tail of other branch or circuit element. The
Delta connection is so called because this connection looks like the Greek alphabet Delta . The
delta connection can also be re arranged to look like a Pi symbol so the network is also
sometimes referred to as Pi Network.
3. Course Content Worksheet EEC/IQAC/Academic/Form1.1.09-R00
EXCEL ENGINEERING COLLEGE
(Autonomous)
Approved by AICTE, New Delhi & Affiliated to Anna University, Chennai
Accredited by NBA, NAAC with “A+” and Recognised by UGC (2f &12B)
KOMARAPALAYAM - 637303
Possible Questions
PART - B
1. Give detail explanation about Star and delta connections.
Star to Delta connection
Delta to Star Connection
