Electrical Technology
Table of Contents Objective – Chapter 1 1 1.0 INTRODUCTION TO ELECTRICAL CIRCUITS 2 Basic Quantities and Units in Electrical 2 Quantities 2 Units 3 Factors Affecting Resistance 4 Length of the Conductor: 4 Area of Cross-Section of the Conductor: 4 Electrical Resistivity of Substances 5 Effect of Temperature 5 Components of Electrical Circuits 6 Components of an Electric Circuit 7 Measuring Current, Voltage and Resistance 8 Measuring voltage 8 Measuring current 9 Measuring resistance 9 Ohm's Law, Electricity 10 Definition of Ohm 11 Unit of resistance is 'ohm' 11 Statement of Ohm's Law 11 Ohm’s law : Current 13 Ohm’s Law : Voltage 13 Ohm’s Law : Resistance 13 Ohm’s Law : Formula Transformation 14 Electric Power and Its Derivation 15 DC POWER: DC Power V and I. 15 Problems - Electrical Power 16 Answers to Problems - Electrical Power 16 Electricity Unit Measure (Electrical energy) 17 Heating effect of electricity 17 SERIES AND PARALLEL RESISTORS: 17 Series Resistors. 18 Two Resistors in Parallel. 18 Three or more Resistors in Parallel. 19 SERIES / PARALLEL RESISTORS: 19 DC VOLTAGE: Voltage Divider. 21 DC VOLTAGE: Loading a Voltage Divider. 21 Problems - The Potential Divider 22 Answers to Problems - The Potential Divider 23 DC CURRENT: Current Divider. 24 Problems - The Current Divider 25 Answers to Problems - The Current Divider 25 Kirchhoff's Laws 26 Kirchhoff's Current Law 27 The algebraic sum of current into any junction is zero. 27 Kirchhoff's Current Law in action 27 i2 + i3 = i1 + i4 27 Kirchhoff's Voltage Law 28 Positive and Negative Signs in Kirchhoff's Voltage Law 28 Kirchhoff's Voltage Law in action 28 Problems - Kirchoff's Laws 30 Answers to Problems - Kirchoff's Laws 31 Exercise 33 CHAPTER 2 37 37 INDUCTOR, CAPACITOR AND ALTERNATING CURRENT 37 Objective – Chapter 2 37 INDUCTOR 38 Basic principles of inductors 38 Inductance 39