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LABORATORY MATERIAL
EE0211 – ELECTRICAL CIRCUITS LAB

DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING
FACULTY OF ENGINEERING & TECHNOLOGY
SRM UNIVERSITY, Kattankulathur – 603 203

1

CONTENTS
Sl
...


Name of the Experiments

Page No
...
1
Date :

VERIFICATION OF KIRCHHOFFS LAWS

Aim:
To verify Kirchhoff’s current law and Kirchhoff’s voltage law for the given circuit
...
No
...

KVL: In any closed path / mesh, the algebraic sum of all the voltages is zero
...

Voltage control knob should be kept at minimum position
...

Current control knob of RPS should be kept at maximum position
...

Give the connections as per the circuit diagram
...

Set a particular value in RPS
...

Note down the corresponding ammeter reading
4
...

Give the connections as per the circuit diagram
...

Set a particular value in RPS
...

Note all the voltage reading
4
...

Voltage
No
...

Voltage
No
...
No
...
68
11
...
05
22
...
42

Current
I2
mA
3
...
18
9
...
49
15
...
6
17
...
1
9
...
6

Voltage
V2
V
4
...
83
13
...
67
22
...
58
1
...
75
2
...
913

4

I1 = I2 + I3
I3
mA
2
...
12
7
...
24
12
...
68
11
...
05
22
...
42

I1 = I2 + I3
I3
mA
2
...
6
12
...
583
1
...
75
2
...
915

mA
5
...
3

KVL
E1 = V1 + V2
V
4
...
99
14
...
993

KVL - Practical Values
Sl
...

RPS
E1
E2
V
V
1
5
5
2
10
10
3
15
15

Voltage
V2
V
4
...
83
13
...
6
1
...
72

V3
V
0
...
19
1
...
96
14
...


5

Experiment No
...

Apparatus Required:
Sl
...

Apparatus
1
RPS (regulated power supply)
2
Ammeter
3
Resistors
4
Bread Board
5
Wires

Range
(0-30V)
(0-10mA)
1k, 330, 220
---

Quantity
2
1
3
-Required

Statement:
Superposition theorem states that in a linear bilateral network containing more than
one source, the current flowing through the branch is the algebraic sum of the current flowing
through that branch when sources are considered one at a time and replacing other sources by
their respective internal resistances
...

2
...

Give the connections as per the diagram
...

Set a particular voltage value using RPS1 and RPS2 & note down the ammeter
reading
3
...

4
...

5
...


6

CIRCUIT - 1

CIRCUIT - 2

CIRCUIT - 3
TABULAR COLUMN
Theoretical Values
Circuit – 1

1
10 V

RPS
2
10 V

Ammeter Reading (I)
mA
I = 8
...
5

Circuit – 3

0V

10 V

I”= 5
...
83

Practical Values
RPS
Circuit – 1

1
10 V

2
10 V

Ammeter Reading (I)
mA
I = 8
...
5

Circuit – 3

0V

10 V

I”= 5
I = I’  I” = 8
...
5 + 5 = 8
...


8

VERIFICATION OF THEVENIN’S THEOREM

Experiment No
...

Apparatus Required:
Sl
...

1
2
3
4
5

Apparatus
RPS (regulated power supply)
Ammeter
Resistors
Bread Board
DRB

Range
(0-30V)
(0-10mA)
1K, 330
---

Quantity
2
1
3,1
Required
1

Statement:
Any linear bilateral, active two terminal network can be replaced by a equivalent
voltage source (VTH)
...

Precautions:
1
...

2
...

Connections are given as per the circuit diagram
...

Set a particular value of voltage using RPS and note down the corresponding
ammeter readings
...

Remove the load resistance and measure the open circuit voltage using multimeter
(VTH)
...

To find the Thevenin’s resistance, remove the RPS and short circuit it and find the
RTH using multimeter
...

Give the connections for equivalent circuit and set VTH and RTH and note the
corresponding ammeter reading
...

Verify Thevenins theorem
...
99

484

9

IL (mA)
Circuit - I
Equivalent
Circuit
3
...
34
3
...
36

Circuit - 1 : To find load current

To find VTH

To find RTH

Thevenin’s Equivalent circuit:

10

Model Calculations:

Result:
Hence the Thevenin’s theorem is verified both practically and theoretically

11

VERIFICATION OF NORTON’S THEOREM

Experiment No
...

Apparatus Required:
Sl
...

1
Ammeter
2
3
4
5

Apparatus

Range
(0-10mA) MC
(0-30mA) MC
330, 1K
(0-30V)
---

Resistors
RPS
Bread Board
Wires

Quantity
1
1
3,1
2
1
Required

Statement:
Any linear, bilateral, active two terminal network can be replaced by an equivalent
current source (IN) in parallel with Norton’s resistance (RN)

Precautions:
1
...

2
...

Procedure:
1
...

2
...

To Find IN:
3
...

4
...

To Find RN:
5
...

Equivalent Circuit:
6
...

7
...


12

To find load current in circuit 1:

To find IN

To find RN

Norton’s equivalent circuit

Constant current source

13

Theoretical and Practical Values
E
IN
(volts)
(mA)

RN
()

IL (mA)
Circuit - I

Theoretical
Values
Practical
Values

10

10
...
34

10

10
...
4

4

Model Calculations:

Result:
Norton’s was verified practically and theoretically

14

Experiment No
...
No
...
3K, 3
---

RPS
Voltmeter
Resistor
DRB
Bread Board & wires

Quantity
1
1
3
1
Required

Statement:
In a linear, bilateral circuit the maximum power will be transferred to the load when
load resistance is equal to source resistance
...

Voltage control knob of RPS should be kept at minimum position
...

Current control knob of RPS should be kept at maximum position
...

Connections are given as per the diagram and set a particular voltage in RPS
...

Vary RL and note down the corresponding ammeter and voltmeter reading
...

Repeat the procedure for different values of RL & Tabulate it
...

Calculate the power for each value of RL
...

Remove the load, and determine the open circuit voltage using multimeter (VTH)
To find RTH:
6
...

7
...

Equivalent Circuit:
8
...

9
...

Verify maximum transfer theorem
...
No
...
3

V(V)
0
...
26

2

400

1
...
481

0
...
1

0
...
707

4

800

1

0
...
771

5

1200

0
...
083

0
...
77

1
...
788

7

1400

0
...
998

0
...
71

0
...
687

RTH ()
1320

IL (mA)
0
...
759

1306

0
...
77

To find Thevenin’s equivalent circuit
VTH (V)
2002
Theoretical
Value
2
Practical Value

17

Model Calculations:

Result:
Thus maximum power theorem was verified both practically and theoretically

18

Experiment No
...
No
...

 Load must not be applied while starting
...

2
...


Give the connections as per the circuit diagram
...

Vary the resistance load and note down the corresponding readings
...

Give the connections as per the circuit diagram
...

Give the supply by closing the TPST switch
3
...


for inductive load

19

Quantity
1
1
2
2

for resistive load
Formulae Used:
1
...


Reactive power =

3
...


Power factor = cos 

3 (w1  w2 )

3 ( w1  w2 )
w1  w2

Two Wattmeter Method : Resistive Load

V
(volt)

460
460
460
460
460
460
460
460
460

I
(A)

0
1
...
7
4
...
5
6
...
2
8
...
12
-277
...
56
-138
...
56
-138
...
12
-277
...
977
0
...
999
0
...
993
0
...
9988
0
...
26
-443
...
39
-1108
...
78
-1829
...
351
0
...
609
0
...
708
0
...


21

Experiment No
...

Apparatus Required:
Sl
...

1
Ammeter
2
Voltmeter
3
4
5
6

Apparatus

Range
(0-5A) MI
(0-150V) MI
(0-300V) MI
230V/115V, 1KVA
100

Transformer
Auto Transformer
Auto Transformer
Rheostat

Quantity
1
2
1
1
1
1

Precaution:
1
...

2
...

The rheostat must be kept at maximum resistance position
...

Give the connections as per the circuit diagram
...

Adjust the auto transformer, to bring the rated voltage of the transformer
3
...

4
...

3 – Voltmeter Method
Sl
...

(amp)
1
0
...
6
3
0
...
1
6
1
...
193
21
...
18
17
...
625
21
...
82
0
...
158
0
...
178
0
...


Power (P) =

VS2  VR2  VL2
watts
2R

R = VR / I
2
...
8
Date :

POWER MEASUREMENT BY 3 - AMMETER

Aim:
To measure the power in an inductive circuit, Eg: transformer, by 3- ammeter method
...
No
...

The DPST switch must be kept open initially
2
...

The rheostat should be kept at maximum resistance position

Procedure:
1
...

Adjust the auto transformer, to bring the rated voltage of the transformer
3
...

4
...

No
...
75
0
...
95
1
...
15
1
...
54
0
...
7
0
...
9
1

IL
(amp)
0
...
48
0
...
48
0
...
46

24

R
(ohm)
213
191
...
3
143
...
7
0
...
31
912
...
9
16
...
1

Cos 
0
...
22
0
...
3
0
...
37

Formulae Used:
Power (P) = R

2

I

2
S

 I R2  I L2



R = V / IR
Power factor cos  =

I S2  I R2  I L2
2 IR IL

Model Calculations:

Result:
Thus power was measured using 3 ammeter method

25

Experiment No
...


Apparatus Required:
Sl
...

1
2
3
4
5

Apparatus
Function generator
DMM
Resistor
Capacitor
CRO

Range
200 
1 F

Quantity
1
1
1
1
1

Procedure:
1
...

2
...

3
...

4
...

5
...

6
...


Circuit Diagram:

26

Sl
...

1

Sl
...

1

Frequency
(Hz)
200

VR
V
0
...
3


deg
21
...
32

VR
V
1
...
2

t
(ms)
750


deg
7
...


27

Experiment No
...


Transient L wave form

2
...
11
Date :

STUDY OF RESOURCE

Aim:
To study series and parallel resource in AC circuit
Series Resource:
An RLC circuit is said to be at re source when voltage and current are in phase with
each other and power factor is unity
...

(i)

ideal parallel circuit f 0 

(ii)

Practical circuit - I f 0 

(iii)

Practical circuit – II f 0 

1
2 u LC

1
2u

1 R2

LC L2
1

2u

 (R ) 2  L / C
L

2

(
R
IC 
L)  L/C

30








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