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Fall 2020
EEE/ETE 241L
Electrical Circuits-II Lab(Sec-4)
Faculty : Md. Abu Obaidah (AbO)
Instructor: Md. Rabiul Karim Khan
Lab No: 03
Series RLC circuits
Name: Abrar Mahir Uddin Sahil
Date of Performance :01/12/2020
ID:2013786643
Date of Submission : 9/12/2020
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Lab 3: Series and Parallel RLC circuits
Experiment 1: Series RLC circuits
Objective
To analyze the relationship between the voltage and phase of reactive
elements and the source in series RC, RL and RLC circuits.
Apparatus
Components Instruments
• Resistors: 1×150Ω • 1× Trainer Board
• Capacitors: 1×1.7µF • 1× Function Generator
• 1× Dual Channel Oscilloscope
• Inductor: 1x440µH
• Connecting wires and probes
Experimental circuit:
R1
150Ω
C1
3.7Vpk 1.7µF
Vs 9.2kHz
0°
Fig. Series RC circuit
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Procedure:
Multisim:
Fig: Measuring the Peak output voltage
Fig: Measuring the time difference using cursor operation
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Swapping R and C:
Fig: Measuring the Peak output voltage
Fig: Measuring the time difference using cursor operation
Delay ΔT θ (Practical)
|Vpeak| (Practical) [ΔT x f x 360]
(Practical) (µS) (º)
(V)
VC 0.250 26 86.112
VR 3.52 1.25 4.14
Θ= ΔT x f x 360=(26*10-6)(9.2*1000)(360)=86.112o
Θ= ΔT x f x 360=(1.25*10-6)(9.2*1000)(360)=4.14o
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Phasor Diagram:
VR
4.14o VS
86.1120
VC
Construct RL Series Circuit:
R1
150Ω
L1
3.7Vpk 440µH
Vs 9.2kHz
0°
Fig: Series RL circuit
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Procedure:
Multisim
Fig: Measuring the Peak output voltage
Fig: Measuring the time difference using cursor operation
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Swapping L2 with R2
Fig: Measuring the Peak output voltage
Fig: Measuring the time difference using cursor operation
Delay ΔT θ (Practical)
|Vpeak|
(Practical) [ΔT x f x 360]
(Practical)
VL 0.626 24 79.488
VR 3.64 3.4 11.261
Θ= ΔT x f x 360=(24*10-6)(9.2*1000)(360)=79.488
Θ= ΔT x f x 360=(3.4*10-6)(9.2*1000)(360)=11.261
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Phasor Diagram:
VL
79.48o
VS
11.261o
VR
Constructing Circuit 3 (Series RLC)
R2 L2
150Ω 440µH
3.7Vpk C1
Vs 9.2kHz 1.7µF
0°
Fig. Series RLC circuit
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Procedure:
Multisim
VC
Fig: Measuring the Peak output voltage
Fig: Measuring the time difference using cursor operation
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VL
Fig: Measuring the Peak output voltage
Fig: Measuring the time difference using cursor operation
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VR
Fig: Measuring the Peak output voltage
Fig: Measuring the time difference using cursor operation
Delay ΔT θ (Practical)
|Vpeak|
(Practical) [ΔT x f x 360]
(Practical)
VC 0.246 29.2 96.7104
VL 0.636 22.4 74.1888
VR 3.5 2.4 7.9488
Θ= ΔT x f x 360=(29.2*10-6)(9.2*1000)(360)=96.7104
Θ= ΔT x f x 360=(22.4*10-6)(9.2*1000)(360)=74.1888
Θ= ΔT x f x 360=(2.4*10-6)(9.2*1000)(360)=7.9488
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Question answer
1. Draw the phasor diagrams for the series RC, RL and RLC circuits
Ans: Done above.
2. How would each of the phasor diagrams change if the source frequency was raised?
Ans: As the frequency raised the phasor diagram also changed as, Θ= ΔT x f x 360, so, if frequency
decreases the angle will also decrease. If angle decreases then the phasor diagram will also change.
Discussion:
The main goal of this experiment was to analyze the relationship between the voltage and phase of
reactive elements and the source in series RC, RL and RLC circuits. For this, we have built RL, RC and
RLC circuit. The using the Tektronix Oscilloscope we have done cursor operation to measure the
Peak voltage and the time difference. After measuring these variables, we have counted the phase
angle by Θ= ΔT x f x 360. Then we have drawn the phase diagram and successfully completed the experiment
using Multisim.
