good ppt exper level

1. DISCOVER . LEARN . EMPOWER
INSTITUTE UIE
DEPARTMENT ACADEMIC UNIT-2
Bachelor of Engineering (Computer Science & Engineering)
Subject Name Introduction to Electrical & Electronics Engineering Lab
Subject Code 23ECH-B-101
Prepared By
Dr.Shikha
Experiment 3
The objective of this lab activity is to demonstrate series RL circuit and
to determine the power factor of the circuit.

2. Importance of Basic Electrical & Electronics
Engineering
• Use from home appliances to industrial plants.
• Usage in communication and satellite navigation system.
• Handles in electronics equipment and computers.
• Deals with the problem of power transmission and motor control.
• Control and monitor the medical appliances in hospitals.
• High voltage applications with heavy current.
• Robotics applications.
• Product designing and development.
2

3. 3
Course
Objectives
S.
No. Objectives
1
Understand Electrical & Electronics Engineering
Fundamentals.
2
To prepare students to perform the analysis and design of
various Electrical & digital electronic circuits.
https://library.automationdirect.com/basic-
electrical-theory/

4. 4
Course
Outcomes
CO
Numbe
r
Title Level
CO1
To identify the different types of electrical elements and the basic op-amp
circuit elements and to illustrate the various types of motors, transducers. Remember
CO2
To understand basic principles of transformers, transducers, op-amps, DC and
AC motors and to compare the different methods for analysing electrical and
magnetic circuits. Understand
CO3
To derive the relationships between parameters in electric and magnetic
circuits and motors and to determine specifications of op-amps. Analyze
CO4
To solve the basic problems related to electric circuits, magnetic circuits and
motors and to assess the characteristics of different configurations of op-amps. Evaluate
CO5
To design the different applications of transducers, motors as well as the op-
amps like adders, subtractor and comparators. Create
https://library.automationdirect.com/basic-
electrical-theory/

5. Objective
• The objective of this lab activity is to demonstrate series RL circuit
and to determine the power factor of the circuit.
5

6. Apparatus Required
6
S.No. Apparatus Name Specification & Rating Quantities in No.
1. 1- AC supply 230 V 1
2. 1- Variac 0 – 270 V, 15 A 1
3. AC wattmeter 0 – 300 V, 5 A, 750 W 1
4. AC Analog ammeter 0 – 5 A 1
5. AC Analog voltmeter 0 – 300 V 1
6. Variable resistive load 230 V, 1 kW 1
7. Variable inductive load 230 V 1
8. Connecting wires As per requirement

7. Theory
• An AC series circuit consisting of a resistor and an inductor is shown
in figure I is the current flowing through the resistor and the inductor.
• The voltage drop across the resistor and the inductor is VR and VL
respectively.
• The Phasor sum of these two voltages will be equal to the applied
voltage.
• In a resistive circuit the voltage and current are in phase. In a pure
inductive circuit the current lags the voltage by 90 degrees.
7

8. Auto Transformer
• An autotransformer (or auto
transformer) is a type of electrical
transformer with only one winding.
• In an auto transformer, one single
winding is used as primary winding as
well as secondary winding.
• An auto transformer has higher
efficiency than two winding
transformer. This is because of less
ohmic loss and core loss due to
reduction of transformer material.
8
Fig.1 Auto transformer
https://circuitglobe.com/what-is-an-auto-transformer.html

9. Voltmeter
• A voltmeter is an instrument used for
measuring electric potential difference
between two points in an electric
circuit.
• t is connected in parallel. It usually has
a high resistance so that it takes a
negligible current from the circuit.
• The voltmeter constructs in such a
manner that their internal resistance
always remains high. If it connects in
series with the circuit, it minimizes the
current which flows because of the
measurand voltage. 9
Fig.2 Voltmeter
https://circuitglobe.com/voltmeter.html

10. Ammeter
• The meter uses for measuring the
current is known as the ammeter.
• The current is the flow of electrons
whose unit is ampere. Hence the
instrument which measures the flows
of current in ampere is known as
ampere meter or ammeter.
• The ideal ammeter has zero internal
resistance. But practically the
ammeter has small internal resistance.
The measuring range of the ammeter
depends on the value of resistance.
10
Fig.3 Ammeter
https://circuitglobe.com/ammeter.html

11. Wattmeter
• Wattmeter is an electric
instrument which is used to measure
the electric power of various electric
circuits.
• It consists of a current coil and
a voltage coil.
• These instruments are widely used
in transmission and distribution of
electric power and these are also used
for protection purposes.
11
Fig.4 Wattmeter
https://circuitglobe.com/low-power-factor-wattmeter.html

12. Circuit Diagram of Series RL Circuit
12
Fig.5 Series RL circuit

13. Calculation
• W =VI Cosϕ----------------------------------------eq. (i)
• Power factor, Cosϕ = [W/(VI)] ---------------eq. (ii)
• Therefore, ϕ = Cos-1[W/(VI)] ------------------eq.(iii)
13

14. Observation Table
14
Sr.
Supply voltage
Vs (V)
Voltage
across
resistor VR
(V)
Voltage
across coil
Vcoil (V)
Current
I (A)
Power P (W)
2.

15. Learning Outcomes
• At the end of this experiment students able to make series
connections.
• Students familiar with circuit components like wattmeter, ammeter,
and voltmeter.
• Students able to measure current, voltage and power of the circuit.
• Students able to calculate impedance of the circuit.
15

16. Viva Voice Questions
• What do you mean by choke coil? Why the name is given so?
• Why power waveform is not symmetrical to X – axis in R – L circuit?
• Give the significance of active, reactive and apparent power.
• Why AC meter always measure RMS value of quantity being
measured?
• What is significance of voltage and reactance triangle?
• Draw vector diagram for R – L series circuit when fed by DC supply.
16

17. Summary
Introduction to series RL circuit.
Demonstration of series RL circuit.
Calculation of series RL circuit.
17

18. Course Outcome to Program Outcome
Relationship
18
(20ELP-152) BEEE
PO→
CO↓ PO1 PO2 PO3 PO4 PO5 PO6 PO7 PO8 PO9 PO10 PO11 PO12
CO1 3 2 0 0 0 0 0 0 0 0 0 0
CO2 3 2 0 0 0 0 0 0 0 0 0 0
CO3 3 2 0 0 0 0 0 0 0 0 0 0
CO4 3 2 0 0 0 0 0 0 0 0 0 0

19. Assessment Pattern
19
A
Worksheet
completion
(each
practical)
B
Post Lab(each
experiment)
C
Student
Engagement
in
Simulation/D
emonstration
/Pre Lab
questions(eac
h experiment)
D
Mid Semester
Test(one per
test)
E
Homework
F
Discussion
Forums (each
experiment)
G
Attendance
and
engagement
Score on BB
10 5 5 20 NA 4 NA

20. References
https://circuitglobe.com/what-is-an-auto-transformer.html [1]
https://circuitglobe.com/voltmeter.html [2]
https://circuitglobe.com/ammeter.html [3]
https://circuitglobe.com/low-power-factor-wattmeter.html [4]
20

21. Other References
• Books: [1]Basic of Electrical Engineering, T. K. Nagsarkar and M. S.Sukhija,2013 ,2nd edition
[2]Theory and problems of Basic Electrical Engineering, J. Nagrath and Kothari, 2012, 2nd edition
[3] A Textbook of Electrical Technology, B.L Theraja,2010,Vol 1
[4] Fundamentals of Electrical and Electronics Engineering, Smarjith Ghosh,2013,1st edition
• E-Books: [1]
http://www.opentextbooks.org.hk/system/files/export/9/9648/pdf/Fundamentals_of_Electrical_Engineering_I_9648.pdf
[2] file:///C:/Users/user/Desktop/Basic%20Electrical%20Engineering%20(%20PDFDrive.com%20).pdf
• Websites: [1] https://www.electrical4u.com/rl-series-circuit/
[2] https://www.electronics-tutorials.ws/inductor/lr-circuits.html
[3] https://circuitglobe.com/what-is-rl-series-circuit.html
• Videos: [1] https://youtu.be/-yeZ20OEFUw
[2] https://youtu.be/nPxHPFFWAjE
[3] https://youtu.be/S10B0Y0HxZg
21

22. THANK YOU
For queries
Email: shikha.e12701@cumail.in
Contact no: +91-9915369888