Bài giảng Electrical and electronic principles: Chương 2 - ThS. Ngô Quốc Cường

Những nội dung chính cần tìm hiểu trong chương này gồm có: Methods of analysis, thevenin’s theorem, norton theorem. Mời các bạn cùng tham khảo để biết thêm các nội dung chi tiết.

TP HỒ CHÍ MINH

ELECTRICAL AND ELECTRONIC PRINCIPLES

WEEK 2

• Branch; node; loop

• KCL

• KVL

2

• Methods of analysis

• Thevenin’s theorem

• Norton theorem

• Mesh analysis

• Nodal analysis

4

• A mesh is a loop which does not contain any other loops

within it

6

• Find the branch currents and using mesh analysis

8

• Use mesh analysis to find the current in the circuit below

• Solution

10

• Mesh Analysis with Current Sources

– Case 1: When a current source exists only in one mesh

• In the above circuit, we set i2 = - 5 A

• Mesh Analysis with Current Sources

– Case 2: When a current source exists between two

meshes

12

• Nodal analysis provides a general procedure for analyzing

circuits using node voltages as the circuit variables

•

• Calculate the node voltages (1; 2) in the circuit below

14

• At node 1

• At node 2

• Finding Vth and Rth

16

• If the network has dependent source

• Find the Thevenin equivalent circuit of the circuit to the left of terminal a-b

• Then find the current through RL = 6, 16 Ω

18

• Problem 1

• Using Thevenin’s theorem, find the equivalent circuit to the

left of the terminals a-b in the circuit below Then find I

20

• Problem 2*

• Find the Thevenin equivalent of the circuit at the terminals:

a-b

22

24

• Finding Norton current

• Problem 5

26

• Answer

• Exercise: Solve the problem 5 by using Thevenin’s theorem

28

• Problem 6

• Answer

30