Chapter 2 Fundamentals of Electric Circuits

Tai-Cheng Lee

Electrical Engineering/GIEE

1

Ideal Voltage Sources

2

Representations of an Electrical System

3

Ideal Current Sources

4

Dependent (Controlled) Sources

5

Branch

6

Node and Supernode

7

Loop

8

Mesh

9

Electric Current

10

Kirchhoff’s Current Law - KCL (I)

11

Kirchhoff’s Current Law - KCL (II)

12

Kirchhoff’s Current Law - KCL (III)

13

Kirchhoff’s Voltage Law – KVL

14

Voltage

15

Sources and Loads

16

Ground

17

Electric Vehicle Battery Pack

18

Application of KVL (I)

19

Application of KVL (II)

20

Electric Power

21

Passive Sign Convention

22

Example

23

Representation of Circuit Elements

24

I-V Characteristics (I)

25

I-V Characteristics (II)

26

Resistance Element and Ohm’s Law

27

Nonlinear Elements

28

Resistor Color Code

29

Resistor Power Ratings

30

Open and Short Circuits

31

Series Resistors and the Voltage Divider

32

Voltage Divider

33

Parallel Resistors and the Current Divider

34

Current Divider

35

Series – Parallel Circuit

36

Wheatstone Bridge

37

Throttle Position Sensor (I)

38

Throttle Position Sensor (II)

39

Resistance Strain Gauges

40

Wheatstone Bridge and Force Measurement

41

Practical Voltage Sources

42

Practical Current Sources

43

Ohmmeter

44

Ammeter

45

Voltmeter

46

Wattmeter

47

Appendix (I)

48

Appendix (II)

49

Appendix (III)

50