Page 5 - Basics of Electrical, Electronic and Communication
P. 5
Contents
1 Basic Concepts in Electrical Engineering 1
1.1 Introductory concepts and basic elements . . . . . . . 1
1.2 Resistances in series . . . . . . . . . . . . . . . . . . 6
1.3 Resistances in parallel . . . . . . . . . . . . . . . . . . 7
1.4 Effect of temperature on resistance . . . . . . . . . . . 8
1.5 Ideal and non-ideal dc voltage sources . . . . . . . . . 9
1.6 Ideal and non-ideal dc current sources . . . . . . . . . 10
1.7 Open circuit voltage and short circuit current . . . . . 11
2 Kirchoff’s laws 17
2.1 Kirchoff’s Laws . . . . . . . . . . . . . . . . . . . . . 17
2.1.1 Kirchoff’s Current Law (KCL) . . . . . . . . . 18
2.1.2 Kirchoff’s Voltage Law (KVL) . . . . . . . . . 19
2.1.3 Steps to solve circuits by Kirchoff’s law . . . . 21
2.2 Voltage divider circuit . . . . . . . . . . . . . . . . . . 21
2.3 Current divider circuit . . . . . . . . . . . . . . . . . . 22
2.4 Source transformation . . . . . . . . . . . . . . . . . . 24
3 Magnetic circuits 33
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . 33
3.2 Magnetic field around a bar magnet . . . . . . . . . . 34
3.3 Magnetic field around a current carrying conductor . . 34
3.4 Magnetic flux . . . . . . . . . . . . . . . . . . . . . . 35
3.5 Magnetic flux density . . . . . . . . . . . . . . . . . . 35
3.6 Magneto motive force . . . . . . . . . . . . . . . . . . 36
3.7 Magnetic field intensity . . . . . . . . . . . . . . . . . 36
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