This document contains a student's homework on circuit analysis. It includes:
1) Two node voltage equations for a given circuit.
2) Calculations of current for another circuit.
3) Identification of the correct method to calculate voltage Vo using Thevenin's theorem.
4) Derivation of the expression for Vo in terms of circuit voltages and resistances using repeated applications of Thevenin's theorem and superposition.
Tín Hiệu Và Hệ Thống - Phép biến đổi LaplaceQuang Thinh Le
Sưu Tầm: Quang Thinh Le
Facebook: https://www.facebook.com/lequangthinhblog
Bộ môn:Tín Hiệu Và Hệ Thống
Nội dung: Phép biến đổi Laplace
Khoa: Điện tử - HaUI ( Faculty: Electronics - HaUI)
Tín Hiệu Và Hệ Thống - Chuỗi Fourier và phép biến đỏi FourierQuang Thinh Le
Sưu Tầm: Quang Thinh Le
Facebook: https://www.facebook.com/lequangthinhblog
Bộ môn:Tín Hiệu Và Hệ Thống
Nội dung: Chuỗi Fourier và phép biến đỏi Fourier
Khoa: Điện tử - HaUI ( Faculty: Electronics - HaUI)
Tín Hiệu Và Hệ Thống - Phép biến đổi LaplaceQuang Thinh Le
Sưu Tầm: Quang Thinh Le
Facebook: https://www.facebook.com/lequangthinhblog
Bộ môn:Tín Hiệu Và Hệ Thống
Nội dung: Phép biến đổi Laplace
Khoa: Điện tử - HaUI ( Faculty: Electronics - HaUI)
Tín Hiệu Và Hệ Thống - Chuỗi Fourier và phép biến đỏi FourierQuang Thinh Le
Sưu Tầm: Quang Thinh Le
Facebook: https://www.facebook.com/lequangthinhblog
Bộ môn:Tín Hiệu Và Hệ Thống
Nội dung: Chuỗi Fourier và phép biến đỏi Fourier
Khoa: Điện tử - HaUI ( Faculty: Electronics - HaUI)
Electric Circuits LabInstructor -----------Serie.docxpauline234567
Electric Circuits Lab
Instructor: -----------
Series RL Circuits
Student Name(s): Click or tap here to enter text.
Click or tap here to enter text.
Honor Pledge:
I pledge to support the Honor System of ECPI. I will refrain from any form of academic dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the academic community, it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a Judicial Review Board for determination. I will report to the Judicial Review Board hearing if summoned.
Date: 1/1/2018
Contents
Abstract 3
Introduction 3
Procedures 3
Data Presentation & Analysis 4
Calculations 4
Required Screenshots 4
Conclusion 4
References 5
Abstract
(This instruction box is to be deleted before submission of the Lab report)
What is an Abstract?
This should include a brief description of all parts of the lab. The abstract should be complete in itself. It should summarize the entire lab; what you did, why you did it, the results, and your conclusion. Think of it as a summary to include all work done. It needs to be succinct yet detailed enough for a person to know what this report deals with in its entirety.
Objectives of Week 2 Lab 2:
· Understand the effect of frequency on inductive reactance.
· Measure the impedance of an RL circuit.
· Measure the phase angle and phase lead of an RL circuit using the oscilloscope.
· Draw the impedance and voltage phasor diagrams.
· Understand how an inductor differentiates current.
Introduction
(This instruction box is to be deleted before submission of the Lab report)
What is an Introduction?
In your own words, explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report. State the objectives of the lab as well as the overall background of the relevant topic.
Address the following items in your introduction:
· What is Impedance for an RL circuit? (Give formula)
· What is phase angle for an RL circuit? How is it calculated?
· What is phase lead for an RL lead circuit? How is it calculated?
· How/why does an inductor differentiate current? Give formula.Procedures
Part I:
1.
Connect the following circuit.
Figure 1: RL Circuit
2.
Connect one DMM across the resistor and one DMM across the inductor.
Set both DMMs to read AC Voltage.
Measure the voltage drop across each component.
Record the result in
Table 1.
3. Use Ohm’s law to
calculate the current flowing through the resistor. Since the circuit in
Figure 1 is a series RL circuit, the same current will flow through the inductor and the resistor.
Record the result in
Table 1.
The difference between mesh and nodal analysis is that nodal analysis is an application of Kirchhoff's current law, which is used for calculating the voltages at each node in an equation. While mesh analysis is an application of Kirchhoff's voltage law which is used for calculating the current.
Electrical engineering, a branch of engineering that deals with the study and application of electricity, electromagnetism, and electronics, lies at the heart of modern technology. This field encompasses a wide range of applications, from power generation and distribution to telecommunications, electronics, and computer systems. Electrical engineers play a pivotal role in shaping the technological advancements that drive our contemporary world.
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1. -Họ và tên: Trần Lê Duy Linh.
-MSSV: 18200032.
- Lớp : 18DTV1_L1.
- Tuần 4.
Bài tập củng cố buổi 4.
Trình bày:
1. Cho mạch điện sau:
Nếu trên các lưới đã chọn, dòng điện chạy trên lưới như hình vẽ (mũi tên lớn). Viết các
biểu thức về sụt áp trên các lưới?
Tóm tắt bài làm:
1. Tại lưới (I): I3R3 + V2 + I1R1 – V1 = 0
Tại lưới (II): I3R3 – I2R2 + V3 = 0
2. 𝐼1 = 2 +
10
9
−
1𝑦
̅
9
=
13
9
(𝐴)
𝐼2 =
15
9
+ 4 −
10
9
=
41
9
(𝐴)
3. B.Dùng định luật Thévenin tại A, sau đó tính phân áp cho Vo.
4. V0 = 𝑣ⅆ𝑐
𝑅2𝑅4
𝑅1𝑅2+𝑅1𝑅3+𝑅1𝑅4+𝑅2𝑅3+𝑅2𝑅4
5. a. V0 =
𝑉0′
16
+
𝑉1
8
+
𝑉2
4
+
𝑉3
2
b. V0 =
0
16
+
5
8
+
5
4
+
0
2
=
15
8
V
+
+
+
-
-
-
V
1
V
2
V
3
R
1 R
2
I
1 I
2
R
3
I
3
2. Ta có b=3, n =2 => l = (b+1)-n = (3+1) -2 = 2
Tại lưới (I): I3R3 + V2 + I1R1 – V1 = 0
Tại lưới (II): I3R3 – I2R2 + V3 = 0
2. Cho mạch điện sau:
Tìm cường độ dòng điện qua R1 và R2?
𝐼1 =
𝑉1
𝑅1 + 𝑅2
=
15
9
= 𝐼2
+
-
V
1
=15V
R
1
=6Ω R
2
=3Ω
+ +
- -
V1
=15V V2
=10V
R1
=6Ω R2
=3Ω
I1
=6A
4. Cách tính Vo đúng là:
a. Tính phân áp tại A, sau đó tính phân áp cho Vo.
b. Dùng định luật Thévenin tại A, sau đó tính phân áp cho Vo.
c. Dùng định luật Thévenin tại A, sau đó dùng định luật Thévenin tại Vo.
d. Tính phân áp tại A, sau đó dùng định luật Thévenin tại Vo.
Ta cần dùng định luật Thévenin tại A, sau đó tính phân
áp cho Vo.
4. Cho mạch điện sau:
Tìm Vo theo Vdc, R1, R2, R3, R4 ?
R4
A
Vdc
Vo
R2
R3
R1
5. Theo dùng định luật Thévenin tại A:
Etd = 𝑣ⅆ𝑐
𝑅2
𝑅1+𝑅2
𝑅𝑡ⅆ =
𝑅1𝑅2
𝑅1+𝑅2
Tính phân áp cho Vo:
𝑉0 = 𝐸𝑡ⅆ
𝑅4
𝑅3+𝑅4+𝑅𝑡𝑑
= 𝑉ⅆ𝑐
𝑅2
𝑅1+𝑅2
𝑅4(𝑅1+𝑅2)
(𝑅3+𝑅4)(𝑅1+𝑅2)+𝑅1𝑅2
= 𝑣ⅆ𝑐
𝑅2𝑅4
𝑅1𝑅2+𝑅1𝑅3+𝑅1𝑅4+𝑅2𝑅3+𝑅2𝑅4
5. Cho mạch điện sau:
a. Tìm biểu thức của Vo?
b. Tính Vo, biết rằng V0, V1, V2, V3 lần lượt là:
0V, Vref, Vref, 0V; với Vref=5V.
Chú ý: để tìm biểu thức của Vo, ta sử dụng nguyên lý chồng chập, trong mỗi trường hợp
sử dụng thêm định luật Thévenin.
2R
V2
Vo
V3
R
2R
+
-
OUT
R
R
R
R
+
-
OUT
R
R
R
2R 2R
V0 V1
Rtd
Etd
R3
R4
Vo
6. a.Tính biểu thức V0:
*Chồng chập V0’, loại V1,V2,V3
Thévenin tại A:
Etđ1 =
𝑉0′
2
, Rtd = R
Thévenin tại B:
Etđ2 =
𝐸𝑡đ1
2
=
𝑉0′
4
, Rtd =
2R
V2
Vo
V3
R
2R
+
-
OUT
R
R
R
R
+
-
OUT
R
R
R
2R 2R
V0 V1
A B C D
2R
V2
Vo
V3
R
2R
+
-
OUT
R
R
R
R
+
-
OUT
R
R
R
2R 2R
V0 V1
B C D
Rtđ
Etđ1
2R
V2
Vo
V3
R
2R
+
-
OUT
R
R
R
R
+
-
OUT
R
R
R
2R 2R
V0 V1
C D
Etđ2
Rtđ
7. Thévenin tại C:
Etđ3 =
𝐸𝑡đ2
2
=
𝑉0′
8
, Rtd = R
Thévenin tại D:
Etđ4 =
𝐸𝑡đ3
2
=
𝑉0′
16
, Rtd = R
V00’ = Etđ4 =
𝑉0′
16
V00’ =
𝑉0′
16
*Tương tư cho các trường hợp ta có:
2R
V2
Vo
V3
R
2R
+
-
OUT
R
R
R
R
+
-
OUT
R
R
R
2R 2R
V0 V1
Etđ3
D
Rtđ
2R
V2
Vo
V3
R
2R
+
-
OUT
R
R
R
R
+
-
OUT
R
R
R
2R 2R
V0 V1
Etđ4
Rtđ
−
𝑉0′
16 𝑉0′
16
8. V01 =
𝑉1
8
V02 =
𝑉2
4
V03 =
𝑉3
2
Biểu thức V0 :
V0 =
𝑉0′
16
+
𝑉1
8
+
𝑉2
4
+
𝑉3
2
b. Tính Vo, biết rằng V0, V1, V2, V3 lần lượt là:
0V, Vref, Vref, 0V; với Vref=5V.
Thế vào biểu thức V0
V0 =
𝑉0′
16
+
𝑉1
8
+
𝑉2
4
+
𝑉3
2
=
0
16
+
5
8
+
5
4
+
0
2
=
15
8
V
Cách khác:
Với Vn = Dn . Vref ; Dn = 0 hoặc Dn =1
n=0’,1,2,3
Ta có : V00’ =
20. 𝐷0′. 𝑉𝑟𝑒𝑓
24
V0’ = 0 = D0 . Vref => D0’ = 0
V1 = 5 = D1 . Vref => D1 = 1
V2 = 5 = D2 . Vref => D2 = 1
V3 = 0 = D3 . Vref => D3 =0
V0 =
20. 𝐷0′+ 21.𝐷1+22. 𝐷2+23. 𝐷3
24
. 𝑉𝑟𝑒𝑓 =
15
8
V