# Deccan College Of Engineering & Technology

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DECCAN COLLEGE OF ENGINEERING & TECHNOLOGY
(Nampally, Dar-us-Salam, Hyderabad) Department of Electrical & Electronics Engineering CIRCUITS & MEASUREMENT LAB MANUAL
for BE - EEE & EIE- V Semester
Prepared by Mrs. Shaziya Sultana, Assoc. Prof. Ms. Roqayya Aimun, Asst. Prof. Mr. Md Ahmeduddin Farooqi, Asst.Prof. Mr. Shaik Mohammed Mukassir, Asst. Prof. Mr. Mohd. shahabuddin, Lab Tech.
Approved by
Dr. Prof. Sardar Ali Head of the department (EEE)

B.E. EEE V SEMESTER DCET

CIRCUITS & MEASUREMENTS LAB MANUAL

Name: ________________________________Roll No: ___________________

INDEX

S.No Date

Name of the Experiment

Page No Sign

1

Verification of KCL & KVL using Mesh and

2

Nodal Analysis

Verification of a) Thevenin’s Theorem

2

b)Norton’s Theorem c)Superposition

5

Theorem d)Max. Power transfer theorem

Open Circuit, Short and ABCD parameters

3

of two port parameters

15

Simulation of 2nd order RLC circuit using

21

4

PSPICE

5

Transient Response of RLC Circuits

25

6

Measurement of low resistance by Kelvin’s

27

Double Bridge

7

Measurement of Active, reactive power

29

measurement using two wattmeter method

Calibration of Single Phase Energy meter by

8

35

Measurement of a) Inductance by

9

Maxwell’s and Andersons Bridge b)

37

Measurement of Capacitance by DeSauty’s

Bridge

Use of DC Potentiometer for measurement

10

of unknown voltage and Impedance

40

1|Page

EXPERIMENT NO.1
VERIFICATION OF KIRCHHOFFS LAW (KCL AND KVL) USING MESH AND NODAL ANALYSIS
AIM: - To verify Kirchhoff’s current law and Kirchhoff’s voltage law for the given circuit using mesh and nodal analysis.
APPARATUS:-

Sl.No Apparatus .

Range

Quantity

1

RPS (regulated power supply)

(0-30V)

2

2

Resistance

3

Ammeter

4

Voltmeter

5

2K, 2K 1k (0-30mA)MC (0-30V)MC --

6 3 3 Required

Statement: KCL: The algebraic sum of the currents meeting at a node is equal to zero. KVL: In any closed path / mesh, the algebraic sum of all the voltages is zero. Precautions: 1. Voltage control knob should be kept at minimum position. 2. Current control knob of RPS should be kept at maximum position. Procedure for KCL: 1. Give the connections as per the circuit diagram. 2. Set a particular value in RPS. 3. Note down the corresponding ammeter reading 4. Repeat the same for different voltages Procedure for KVL: 1. Give the connections as per the circuit diagram. 2. Set a particular value in RPS. 3. Note all the voltage reading 4. Repeat the same for different voltages

2|Page

B.E. EEE V SEMESTER DCET Circuit - KCL

CIRCUITS & MEASUREMENTS LAB MANUAL

Circuit - KVL

KCL - Theoretical Values:

Voltage

Current

S.No.

E

I1

I2

I3

I1=I2 + I3

Volts

mA

mA

mA

1

5

2

10

3

15

4

20

5

25

3|Page

B.E. EEE V SEMESTER DCET

CIRCUITS & MEASUREMENTS LAB MANUAL

KCL - Practical Values:

Voltage

Current

S.No.

E

I1

I2

I3

I1=I2 + I3

Volts

mA

mA

mA

1

5

2

10

3

15

4

20

5

25

KVL – Theoretical Values

1

5

5

2

10

10

3

15

15

4

20

20

5

25

25

KVL
E2=V2+V3 V

KVL - Practical Values

KVL
E2=V2+V3 V

1

5

5

2

10

10

3

15

15

4

20

20

5

25

25

Model Calculations:

Result:Thus Kirchoff’s voltage load and Kirchoff’s current law verified both theoretically and practically.
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B.E. EEE V SEMESTER DCET

CIRCUITS & MEASUREMENTS LAB MANUAL

EXPERIMENT NO.2

VERIFICATION OF (A) THEVENIN’S THEOREM (B) NORTON’S THEOREM (C) SUPERPOSITION THEOREM (D) MAXIMUM POWER TRANSFER THEOREM

PART-1 AIM: - To verify Thevenin’s Theorem. APPARATUS:-

S.No 1 2 3 4 5 6 7

Apparatus Regulated power supply
Ammeter Voltmeter Ohmmeter Circuit board Decade resistance box Connecting wires

Type -
MC MC Digital
-

Range 0-30 Volts 0-20 mA 0-20 Volts 0-10 ohms
0-10KΩ
-

Quantity 1 1 1 1 1 1
As required

THEORY:-
THEVENIN’S THEOREM: -
Any linear bilateral network with respect to a pair of terminals may be replaced by a voltage source Vth, where Vth is open circuit voltage (i.e. Voltage across the terminals when RL is removed ) in series with resistance equal to Thevenin’s resistance Rth, where Rth is the internal resistance of the network from terminals A and B with voltage sources replaced by their internal resistances, if any , and current sources by infinite resistance. The current flowing through a load Resistance RL connected across any two terminals A and B of a linear, passive, bilateral network is given by
IL = Vth / (Rth + RL)
CIRCUIT DIAGRAM:

Fig. 1

5|Page

B.E. EEE V SEMESTER DCET

CIRCUITS & MEASUREMENTS LAB MANUAL

Fig. 2

Fig 3

Fig 4

PROCEDURE:-

1. Connect the circuit as shown in the diagram and apply suitable voltage, remove RLand. note down the open circuit voltage (Vth) across terminals A & B. (Fig.2).

2. Connect the circuit as shown in Fig.3. And note the Thevenin’s Resistance Rth by means of a multi meter (Ohm meter).

3. Connect the circuit as shown in Fig.1. For a particular value of load resistance RL, keeping the voltage of RPS at the same value as in step 1, note the value of the current. Verify the value obtained by applying the Thevenin’s theorem i.e. IL should be equal to Vth/ (Rth + RL).

4. Repeat step 3, for various values of load resistances and compare with the calculated values as obtained by applying Thevenin’s theorem.

5. Vary the input voltage and take three sets of readings (step 2. Need not be repeated as long as the network is not changed).

6. Fig. 4 shows the Thevenin equivalent circuit with load resistor.

6|Page

B.E. EEE V SEMESTER DCET
THEORITICAL CALCULATIONS:-
Rth = 𝑅2 + 𝑅𝑅11+𝑅𝑅33 =
𝑉𝑠 Vth = 𝑅3 * 𝑅1+𝑅3 =
𝑉𝑡ℎ IL = 𝑅𝑡ℎ+𝑅𝐿

CIRCUITS & MEASUREMENTS LAB MANUAL

OBSERVATIONS:-

Vs = 5 V;

Vth = ______ volts;

Rth = _____ Ω

S. No. RL (Ω)

IL(mA) Measured Value

IL = 𝑉𝑡ℎ (mA)
𝑅𝑡ℎ+𝑅𝐿
(By applying theorem)

RESULT:- Thevenin’s Theorem is verified.

7|Page

B.E. EEE V SEMESTER DCET

CIRCUITS & MEASUREMENTS LAB MANUAL

PART-2

AIM: - To verify Norton’s Theorem

APPARATUS:-

S.No 1 2 3 4 5 6 7

Apparatus Regulated power supply
Ammeter Voltmeter Ohmmeter Circuit board Decade resistance box Connecting wires

Type -
MC MC Digital
-

Range 0-30 Volts 0-20 mA 0-20 Volts 0-10 ohms
0-10KΩ
-

Quantity 1 1 1 1 1 1
As required

THEORY:-

NORTON’S THEOREM:

Any linear bilateral network with respect to a pair of terminals may be replaced by a current source, whose value is equal to the current passing through it when short circuited, in parallel with a resistance equal to the Thevenin’s resistance. Then the current through the load resistance is given by

CIRCUIT DIAGRAM:-

IL = Isc* 𝑅𝑁
𝑅𝑁+ 𝑅𝐿

Fig.1

Fig. 2

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B.E. EEE V SEMESTER DCET

CIRCUITS & MEASUREMENTS LAB MANUAL

Fig. 3

Fig. 4

PROCEDURE:-
1. Connect the circuit as shown in Fig. 2. and applying suitable voltage through RPS. Determine the short circuit current. ( Isc )
2. Connect the circuit as shown in Fig.1and note down the load currents for various values of load resistance (RL) and compare with the theoretical values obtained using Norton s equivalent circuit. ( Fig. 4)
3. Repeat step 1& 2 for various values of source voltages (Note RN obtained from Fig. 3 is the same value as the one obtained in Thevenin’s equivalent circuit)
THEORITICAL CALCULATIONS:-

RN = 𝑅2 + 𝑅𝑅11+𝑅𝑅33 =

I = 𝑉𝑠 =
𝑅

ISC = 𝐼 ∗ 𝑅3 = 𝑅2+𝑅3

𝑅𝑁 IL = ISC * 𝑅𝑁+𝑅𝐿

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