1. Principles of Electric Circuit
Lecture # 1
Principles of Electric Circuit
207 MDE
2010/ /1432
Winter semester 311
Tarek Elsarnagawy
Prof. assc. Dr. Ing.
Tel.: – 497 or 516
Office hours:

2. Principles of Electric Circuits: Conventional
Textbook
Principles of Electric Circuits: Conventional
Current Version, 9/E Thomas L. Floyd
ISBN-10:  X ISBN-13:  
Publisher:  Prentice Hall Copyright:  2010 Format:  Cloth; 992 pp Published:  03/05/2009

3. Evaluation and assessment
Assignments 5%
Seminars/oral 5%
Quizzes 5%
Mid term 15%
Practical/lab 30%
Final 40%

4. Chapter 1

5. Passive & Active components

6. Passive Components
Welcome to the Principles of Electric Circuits. You will study important ideas that are used in electronics. You may already be familiar with a few of the important parts used in electronic circuits. Resistors are introduced in Chapter 2.
Resistors

7. Passive Components Capacitors will be introduced in Chapter 12.

8. Passive Components Inductors will be introduced in Chapter 13.

9. Passive Components Transformers will be introduced in Chapter 14.

10. Active Components
Passive components are used in conjunction with active components to form an electronic system. Active components will be the subject of future courses.
Transistors
Integrated Circuits

11. Quantities and Units

12. International System of Units “System International d’Unites”
SI Fundamental Units
Quantity Unit Symbol
Length
Meter m
Kilogram kg
Second s
Ampere A
Kelvin K
Candela cd
Mole mol
Mass
Time
Electric current
Temperature
Luminous intensity
Amount of substance

13. Some Important Electrical Units
Except for current, all electrical and magnetic units are derived from the fundamental units. Current is a fundamental unit.
Quantity Unit Symbol
Current
Ampere A
Coulomb C
Volt V
Ohm W
Watt W
Charge
Voltage
Resistance
Power

14. Some Important Magnetic Units
All magnetic units are derived from the fundamental units. These units are discussed in Chapter 10.
Quantity Symbol Unit Symbol
Ampere-turns/meter At/m
Weber Wb
Tesla T
Ampere-turn At
Webers/ampere-turns-meter Wb/At.m
Ampere-turns/weber At/Wb
Magnetic field intensity H
Magnetic flux f
Magnetic flux density B
Magnetomotive force Fm
Permeability m
Reluctance R

15. Example-1 Scientific and Engineering Notation
Very large and very small numbers are represented with scientific and engineering notation.
Example-1
47,000,000 = 4.7 x 107 (Scientific Notation)
= 47. x 106 (Engineering Notation)

16. Example-2 Example-3 Scientific and Engineering Notation
= 2.7 x 10-5 (Scientific Notation)
= 27 x 10-6 (Engineering Notation)
Example-3
0.605 = 6.05 x 10-1 (Scientific Notation)
= 605 x 10-3 (Engineering Notation)

17. Large Engineering Metric Prefixes P T G M k peta tera giga mega kilo
1015
1012
109
106
103
Can you name the prefixes and their meaning?

18. Small Engineering Metric Prefixes m n p f milli micro nano pico femto
10-3
10-6
10-9
10-12
10-15
Can you name the prefixes and their meaning?

19. Example-1 Metric Conversions Smaller unit 0.47 MW = 470 kW
When converting from a larger unit to a smaller unit, move the decimal point to the right. Remember, a smaller unit means the number must be larger.
Smaller unit
Example-1
0.47 MW = 470 kW
Larger number

20. Example-2 Metric Conversions Larger unit 10,000 pF = 0.01 mF
When converting from a smaller unit to a larger unit, move the decimal point to the left. Remember, a larger unit means the number must be smaller.
Larger unit
Example-2
10,000 pF = 0.01 mF
Smaller number

21. Example-1 Metric Arithmetic 10,000 W + 22 kW =
When adding or subtracting numbers with a metric prefix, convert them to the same prefix first.
Example-1
10,000 W + 22 kW =
10,000 W + 22,000 W = 32,000 W
Alternatively,
10 kW + 22 kW = 32 kW

22. Example-2 Metric Arithmetic 200 mA + 1.0 mA =
When adding or subtracting numbers with a metric prefix, convert them to the same prefix first.
Example-2
200 mA mA =
200 mA + 1,000 mA = 12,000 mA
Alternatively,
0.200 mA mA = 1.2 mA

23. Significant Figures
Most work in electronics involves measurements, which always have error. You should report only digits that are reasonably assumed to be accurate.
The rules for determining if a reported digit is significant are
Nonzero digits are always considered to be significant.
Zeros to the left of the first nonzero digit are never significant.
Zeros between nonzero digits are always significant.
Zeros to the right of the decimal point for a decimal number are significant.
Zeros to the left of the decimal point with a whole number may or may not be significant depending on the measurement.

24. Examples: Significant Figures
Looking at the rule, decide how many significant figures in each of the examples, which are given with a rule:
Nonzero digits are always considered to be significant.
152.71
2. Zeros to the left of the first nonzero digit are never significant.
0.0938
3. Zeros between nonzero digits are always significant.
10.05
4. Zeros to the right of the decimal point for a decimal number are significant.
5.100
5. Zeros to the left of the decimal point with a whole number may or may not be significant depending on the measurement.
5100.

25. Quiz 1. A resistor is an example of a. a passive component
b. an active component
c. an electrical circuit
d. all of the above

26. Quiz 2. The electrical unit that is fundamental is the a. volt b. ohm
c. coulomb
d. ampere

27. Quiz 3. In scientific notation, the number 0.000 56 is written
a. 5.6 x 104
b. 5.6 x 10-4
c. 56 x 10-5
d. 560 x 10-6

28. Quiz 4. In engineering notation, the number 0.000 56 is written
a. 5.6 x 104
b. 5.6 x 10-4
c. 56 x 10-5
d. 560 x 10-6

29. Quiz
5. The metric prefix nano means
a. 10-3
b. 10-6
c. 10-9 d

30. Quiz
6. The metric prefix pico means
a. 10-3
b. 10-6
c. 10-9 d

31. Quiz 7. The number 2700 MW can be written a. 2.7 TW b. 2.7 GW
c. 2.7 kW
d. 2.7 mW

32. Quiz 8. The value 68 kW is equal to a. 6.8 x 104 W b. 68, 000 W
c MW
d. All of the above

33. Quiz 9. The sum of 330 mW + 1.5 W is a. 331.5 mW b. 3.35 W c. 1.533 W
d W

34. Quiz 10. The quantity 200 mV is the same as a. 0.000 200 V b. 20 mV
c V
d. all of the above

35. Quiz
Answers:
1. a
2. d
3. b
4. d
5. c
6. d
7. b
8. d
9. d
10. a