Circuit Analysis Lab

Stani Memorial College of Engineering And Technology, Phagi
Electrical Engineering
3EE8A Electrical Circuit Lab Manual
1
LAB MANUAL
Subject Code: 3EE8A
ELECTRICAL CIRCUIT LAB
(II B. Tech III Semester EE)
Established in year 2000
DEPARTMENT OF ELECTRICAL ENGINEERING
STANI MEMORIAL COLLEGE OF ENGINEERING & TECHNOLOGY,
PHAGI, JAIPUR – 303005
Website: www.smcet.in

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3EE8A ELECTRICAL CIRCUIT LAB
SYLLABUS
1. Draw the circuit symbols.
2. Verify theorems for A. C. & D. C. circuits.
3. PSPICE Programs for Circuit Analysis:
A. DC: Analysis resistor networks to determine node voltages,
components voltages, and component currents.
B. DC: Analysis of resistor networks that have several voltage and
current sources and variable load resistors.
C. Transient: Analysis of RC & RL circuits to produce tables of
component voltage & current levels for a given set of time
instants & to produce graphs of voltages & currents versus time.
D. AC: Analysis of impedance networks to determine the
magnitude & phase of node voltages, components voltages and
component currents.
4. Determine the magnitude & phase and component voltages and
currents in resonant circuits & produce voltage and current verses
frequency graphs.
5. Programs for Circuit Analysis:
A. Calculate the resistance of a conductor, given its dimensions
& resistivity or determine the change in conductor resistance
when the temp changes.
B. D.C.: Analysis of resistor networks to determine all junction
voltages, component voltages, and component currents.
C. Transient: Analysis RC & RL circuits to produce tables of
component voltage & current levels for a given set of time
instants.
6. Convert Y-connected resistor networks to delta-connected circuits.

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EXPERIMENT NO. 1
Aim: - Draw the circuit symbols.
Apparatus Required: - Resistors, Capacitors, Transistor, Diode, Batteries, single cell, multi-cell
Inductor, Transformer
Theory:-
1 Resistors
2 Potentiometer:
3 Capacitors
4
NPN Transistor
5
PNP transistor
6
n-channel junction gate field-effect
transistor (JFET)
7
p-channel junction gate field-effect
transistor (JFET)
8
Field-effect transistor
9
Diode
10
Zener diode
11
Tunnel diode

4
12
Schottky diode
13
Light Emitting Diode (LED)
14
Photodiode
15
Varicap
16
Vacuum tube diode
17
Vacuum tube triode
18
Vacuum tube tetrode
19
Vacuum tube pentode
20
Switch, Single Pole/Single Throw
(SPST)
21
Switch, Single Pole/Double Throw
(SPDT)
22
Switch, Double Pole/Double Throw
(DPDT)
23
Batteries, single cell, multi-cell
24
Inductor
25
Transformer, with center tap

5
26
Silicon-controlled rectifier
27
Fuse: IEC (top) and American (lower
two)
28
Shielded Wire
29
Tie Point
30
Ground Connection
31
Ground Chassis
32
Connecter
33
Push Button
34
Manually operated Switch (Normally
Opened and Closed )
35
Circuit Breaker
36
Relay Coil
37
Transformer
38
Tachometer
Circuit Diagram:-
Precaution :-
1. Do not touch any live conductor.
2. Study the symbol of element very carefully.

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Procedure:-
Observation Table:-
Calculations:-
Result:- Drawing the circuit symbol has been done.
References:-
1. Circuit Theory (A. Chakrabarti)
2. http://www.allbookez.com/chakrabarti-circuit-theory/
Viva voice Question:-
Q.1 what is the role of transformer ?
Q.2 which quantity is measured by Tachometer?

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EXPERIMENT NO. 2
Aim:- Verify theorems for A. C. & D. C. circuits.
Apparatus Required:- Resistance, capacitor, AC source ,DC source, inductance etc.
Theory:-
Circuit Diagram:-
1. Simulation for DC Theorems:-
Fig. 1:- Simulation Diagram

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2. Simulation for AC Theorem:-
Fig 2:-Circuit diagram for Simulation.
Precaution:-
1. Connection should be proper. Loose connection is not allowed.
2. Do not touch any live wire or part.
3. Before switch on the supply, the connection should be checked by lab assistant.
4. Do not damage the terminals of part or wire etc.
Procedure:-
Observation Table:-
Observation Table I:-
S. No. Component Name Component Value
1 DC Volt. Source (V) 100 Volt.
2 Resistance (R1) 10 Ohm

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Observation Table II:-
S. No. Compnent Name Component Value
1 AC Voltage Source (v) 100 volt., 50 Hz.
4 Inductor (L1) 0.16 H
5 Capaciter (C1) 0.0062 F
Result:- We have successfully Verified theorems for A. C. & D. C. circuits.
Simulation Results:-
S. No. Component Name Volt. Drop Current
1 Resistance (R1) 28.81 Volt. 2.881 Amp.
Fig.3: (a) Volt. and Current in Resistance R1, (b) Volt. and Current in Inductor L1.
Fig. 4: (a) Volt. and Current in Resistance R2 (b) Volt. and Current in Capacitor C1.

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References:-
2. http://www.engr.siu.edu/staff1/hatz/ECE235/ECE235LabManual.pdf
Viva voice Question:-
Q. 1 Give the statement of Superposition Theorem.
Q. 2 State the Nortan Theorems.

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EXPERIMENT NO. 3
Aim:- DC-analyze resistor networks to determine node voltages, components voltages, and
component currents.
Theory:-
Circuit Parameter:-
S. No. Component Name Component Value
1 DC Volt. Source (V) 100 Volt.
Circuit Diagram:-
Fig. 1:- Simulation Diagram
Precaution:-

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Procedure:-
Observation Table:-
Calculations:-
Results:-
S. No. Component Name Volt. Drop Current
References:-
Viva- Voice:-
Q.1 Give the statement of KVL.
Q.2 Make the circuit symbol of Zener Diode.

13
EXPERIMENT NO. 4
Aim:- Analyze resistor networks that have several voltage and current sources and variable load
resistors.
Theory:-
Circuit Parameters:-
S. No Component Component Value
1 Voltage Source (V1) 20 Volt.
2 Voltage Source (V2) 10 Volt.
3 Voltage Source (V3) 100 Amp.
4 Current Source (I1) 2 Amp.
5 Current Source (I2) 1 Amp.
13 Resistance (RL) 10 Ohm
Circuit Diagram:-
Fig.1:-Simulation diagram of the circuit

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Precaution:-
Procedure:-
Observation Table:-
Calculations:-
Results:- We have performed the experiment and obtained load current value 1.355.
References:-
Viva- Voice:-
Q.1 Give the statement of KCL.
Q.2 Make the Circuit symbol of Variable capacitance.

15
EXPERIMENT NO. 5
Aim:- Transient –analyze RC & RL circuits to produce tables of component voltage & current levels
for a given set of time instants & to produce graphs of voltages & currents versus time.
Theory:-
Circuit parameters:-
S. No. Component Name Component value / Rating
1 Battery 4 Volt.
2 Resistance (R) 8 Ohm
3 Inductance (L) 18 mH
S. No. Component Name Component value / Rating
1 Battery 4 Volt.
3 Capacitance (C) 1 mF
Circuit Diagram:-
RL transient Circuit:
Fig. 1:- Circuit for R-L transient

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RC Transient Circuit:-
Fig. 3: Simulation Circuit for R-C Transient.
Precaution:-
Procedure:-
Observation Table:-
Calculations:-
Results:- We have analyzed RC & RL circuits to produce tables of component voltage & current
levels for a given set of time instants & to produce graphs of voltages & currents versus time.

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Fig. 2:-Simulation result for R-L transient (a) Current through the circuit. (b) Voltage across
inductor. (c) Voltage across Resistance.
Fig. 4:-Simulation result for R-C transient (a) Current through the circuit. (b) Voltage across
capacitor. (c) Voltage across Resistance.
References:-
2. http://www.engr.siu.edu/staff1/hatz/LabManual.pdf
Viva- Voice:-
Q.1 Give the statement of Maximum Power Transfer Theorem.
Q.2 Make the Circuit symbol of CRO.

18
EXPERIMENT NO. 6
Aim:- AC-analyze impedance networks to determine the magnitude & phase of node voltages,
components voltages and component currents.
Theory:-
S. No. Compnent Name Component Value
1 AC Voltage Source (v) 100 volt., 50 Hz.
4 Inductor (L1) 0.16 H
5 Capaciter (C1) 0.0062 F
Circuit Diagram:-
Fig 1:-Circuit diagram for Simuliation.
Precaution:-

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Procedure:-
Observation Table:-
Calculations:-
Results:- We have analyzed impedance networks to determine the magnitude & phase of node
voltages, components voltages and component currents
Fig. 2: (a) Volt. and Current in Resistance R1, (b) Volt. and Current in Inductor L1.
Fig. 3: (a) Volt. and Current in Resistance R2 (b) Volt. and Current in Capacitor C1.

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References:-
2. Hayt&Kemmerly, “Engineeirng Circuit Analysis”, 6/e (TMH)
Viva- Voice:-
Q.1 Give the statement of Maximum Power Transfer Theorem.
Q.2 Make the Circuit symbol of CRO.

21
EXPERIMENT NO. 7
Aim:- Determine the magnitude & phase and component voltages and currents in resonant circuits &
produce voltage and current v/s frequency graphs.
Theory:-
S. No Component Component Value
1 Source Voltage 230
3 Inductance (L) 0.01 H
4 Capacitance (C) 0.0010 F
Circuit Diagram:-
Fig.1:-Simulation diagram of the circuit.
Precaution:-

22
Procedure:-
Observation Table:-
Calculations:-
Results:- We have Determined the magnitude & phase and component voltages and currents in
resonant circuits & produce voltage and current v/s frequency graphs.
Fig 2:- Output of vl and vc ((output of scope).
Fig. 3:- Current in circuit (output of scope1).

23
Fig 4:- Volt across resistance (output of scope 2).
References:-
2. http://www.engr.siu.edu/staff1/hatz/LabManual.pdf
Viva- Voice:-
Q.1 Give the statement of Maxwell Theorem.
Q.2 Make the Circuit symbol of Diode.

24
EXPERIMENT NO. 8
Aim:- Calculate the resistance of a conductor given it’s dimension and resistivity, also determine the
change in conductor when the temp. changes.
Apparatus Required:- Power supply, Turbo C++.
Theory:-
Program:-
%Calculate the resistance of a conductor given it’s dimension and
%resistivity, also determine the change in conductor when the temp.
%changes.
clc
clear
ch=1;
while (ch==1)
disp('1 if Resistivity, length, Cross Section Area is Given and 2 if Temp.')
disp(' coefficient, Old Temp. Resistance, Temp Difference given')
choice=input('Enter your choice: ');
switch (choice)
case 1
ro = input('Enter the value of conductor resistivity(in ohm/m^2): ');
l = input('enter the value of length (in meter): ');
A = input('enter the value of area (in meter^2): ');
R = ro*l*A
ch=input('If You want to calculate more, than enter 1 else 2 ');
case 2
t1 = input('enter value of initial temperature(in degree celcious): ');
t2 = input('enter value of final temperature (in degree celcious): ');
t = t2 - t1;
r1 = input('resistance at temp. t1 (in ohm): ');
a= input('enter value of temperature co-efficient: ');
disp('resistance at t2 (in ohm): ')
R2 = r1*(1+(a*t))
otherwise
disp('Incorrect input argument, to find parameter please run program again')
disp('Thanks Program by ASHOK KUMAR')
end
end

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Circuit Diagram:-
Precaution:-
1. Do not tamper with software settings.
Procedure:-
Observation Table:-
Calculations:-
Results:-
Output
1 if Resistivity, length, Cross Section Area is Given and 2 if Temp.
coefficient, Old Temp. Resistance, Temp Difference given
Enter your choice: 1
Enter the value of conductor resistivity(in ohm/m^2): 0.00043
enter the value of length (in meter): 2
enter the value of area (in meter^2): 5
R =

26
0.0043
If You want to calculate more, than enter 1 else 2 1
1 if Resistivity, length, Cross Section Area is Given and 2 if Temp.
cofficient, Old Temp. Resistance, Temp Difference given
enter value of initial temperature(in degree celcious): 37
enter value of final temperature (in degree celcious): 54
resistance at temp. t1 (in ohm): 2
enter value of temperature co-efficient: 3
resistance at t2 (in ohm):
R2 =
104
>>
References:-
Viva- Voice:-
Q.1 what is dependency of temp on the resistance?
Q.2 Make the Circuit symbol of Temp Dependent Resistance.

27
EXPERIMENT NO. 9
Aim :- D.C.-analyze resistor networks to determine all junction voltages, component voltages, and
component currents.
Theory:-
Program:-
%This Program calculate:-
%D.C.-analyze resistor networks to determine all junction voltages,
%component voltages, and component currents.
clc
clear
% First Input all circuit papameters
V=input('Enter the value of source voltage (In Volt.) = ');
R1=input('Enter the value of Resistance R1 (In Ohm)) = ');
%Now total current I in the circuit will be given by I=V/Req
%and Req is given by Req=(R1+(R4*(R2+R3))/(R2+R3+R4))
Req=(R1+(R4*(R2+R3))/(R2+R3+R4));
I=V/Req;
% From Current division rule current in R2 will be given by
%I2=I*R4/(R2+R3+R4)
I2=I*R4/(R2+R3+R4);
% From Current division rule current in R2 will be given by
%I2=I*(R2+R3)/(R2+R3+R4)
I3=I*(R2+R3)/(R2+R3+R4);
%Now Display all quantity
disp('Current through R1 is'), I
disp('Voltage across R1 is '), V1=I*R1
disp('Current through R2 is'), I2
disp('Voltage across R2 is '), V2=I2*R2
disp('Node Voltage Vnode is '),Vnode=V4

28
Circuit Diagram:-
Fig 1:-Reference Circuit for the program.
Precaution:-
Procedure:-
Observation Table:-
Calculations:-
Results:-
Enter the value of source voltage (In Volt.) = 100
Enter the value of Resistance R1 (In Ohm)) = 10

29
Current through R1 is
I =
2.8814
Voltage across R1 is
V1 =
28.8136
I2 =
1.6949
V2 =
50.8475
I2 =
1.6949
V3 =
20.3390
I3 =
1.1864
V4 =
71.1864
Node Voltage Vnode is

30
Vnode =
71.1864
>>
References:-
Viva- Voice:-
Q.1 what is Junction Voltage?
Q.2 Make the Circuit symbol of dependent voltage source.

31
EXPERIMENT NO. 10
Aim:- Transient analysis RC & RL ckts to produce table of component volts and current levels for
given set of your time interval.
Theory:-
Program:-
%Transient analysis RC & RL ckts to produce table of component volts and
%current levels for given set of your time interval.
clc
clear
ch=1;
while (ch==1)
disp('Enter 1 for R-L ckt or 2 for R-C ckt.')
choice=input('Enter your choice: ');
switch (choice)
case 1
disp('Please enter circuit parameter for Series R-L circuit: ')
R=input('Enter the value of circuit Resistance R (in Ohm): ');
L=input('Enter the value of circuit Inductance L (in Henery): ');
V=input('Enter the value of circuit Voltage V (in Volts.): ');
t=input('Enter the value of Time t (in sec): ');
I=(V/R)*(1-exp(-R*t/L))
VR=I*R
VL=V-VR
case 2
disp('Please enter circuit parameter for Series R-C circuit: ')
R=input('Enter the value of circuit Resistance R (in Ohm): ');
C=input('Enter the value of circuit Inductance C (in Farad): ');
V=input('Enter the value of circuit Voltage V (in Volts.): ');
t=input('Enter the value of Time t (in sec): ');
I=(V/R)*(1-exp(-R*t*C))
VR=I*R
VC=V-VR
otherwise

32
end
end
disp('Thanks Program by XYZ')
Circuit Diagram:-
Precaution:-
Procedure:-
Observation Table:-
Calculations:-
Result:-
Enter 1 for R-L ckt or 2 for R-C ckt.
Please enter circuit parameter for Series R-L circuit:
Enter the value of circuit Resistance R (in Ohm): 10
Enter the value of circuit Inductance L (in Henery): .018
Enter the value of circuit Voltage V (in Volts.): 50

33
Enter the value of Time t (in sec): .0032
I =
4.1549
VR =
41.5493
VL =
8.4507
Enter 1 for R-L ckt or 2 for R-C ckt.
Please enter circuit parameter for Series R-C circuit:
Enter the value of circuit Resistance R (in Ohm): 10
Enter the value of circuit Inductance C (in Farad): .018
Enter the value of circuit Voltage V (in Volts.): 50
Enter the value of Time t (in sec): .0032
I =
0.0029
VR =
0.0288
VC =
49.9712
disp('Thanks Program by XYZ)
>>

34
References:-
Viva- Voice:-
Q.1 value of internal resistance of idea voltage source?
Q.2 Make the Circuit symbol of independent voltage source.

35
EXPERIMENT NO. 11
Aim:- Convert Y-connected resistor networks to delta-connected circuits.
Theory:-
Program:-
clc
clear
ch=1;
while (ch==1)
choice=input('Enter your choice: 1 for Y-D and 2 for D-Y Transformation ');
switch (choice)
case 1
R1=input('Enter the value of resistance 1 ');
R12=(R1*R2)/(R1+R2+R3)
R23=(R2*R3)/(R1+R2+R3)
R31=(R3*R1)/(R1+R2+R3)
case 2
R1=(R12*R23+R23*R31+R31*R23)/R23
R2=(R12*R23+R23*R31+R31*R23)/R31
R3=(R12*R23+R23*R31+R31*R23)/R12
otherwise
end
end

36
Circuit Diagram:-
Precaution:-
Procedure:-
Observation Table:-
Calculations:-
Result:-
Enter your choice: 1 for Y-D and 2 for D-Y Transformation 1
Enter the value of resistance 1 4
R12 =
1.3333
R23 =
1.3333
R31 =

37
1.3333
Thanks Program by ASHOK KUMAR
Enter your choice: 1 for Y-D and 2 for D-Y Transformation 2
R1 =
12
R2 =
12
R3 =
12
Thanks Program by XYZ
References:-
Viva- Voice:-
Q.1 value of internal resistance of idea current source?
Q.2 Make the Circuit symbol of independent current source.

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