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- 430 pages
- English
- ePUB (mobile friendly)
- Available on iOS & Android
eBook - ePub
Electrical Science for Technicians
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About This Book
An indispensable resource for electrical technicians and trainees, Electrical Science for Technicians walks readers through the subject in a logical order, providing a historical overview alongside modern electrical theory and practice. You will be guided through the subject in a topic by topic manner with each section building upon the one that came before it. By adding context to the principles of electrical science they become easier to both understand and remember, providing a background in the subject that will remain with you for life.
- Fully aligned to the 17th edition of the wiring regulations
- Topic-based approach ensures suitability for both technicians and students
- Clear objectives outlined at the start and revisited at the end of each chapter as a checklist allow readers to check their learning before moving on
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Information
CHAPTER | 1 |
Solving complex circuits: network theorems
Objectives
On completion of this chapter you should be able to:
1. recognise a complex circuit.
2. apply âsense arrowsâ to complex circuits.
3. identify junctions (ânodesâ) and loops (âmeshesâ) in complex circuits.
4. recognise complex circuits to which the following ânetwork analysisâ techniques may be applied:
a. Kirchhoffâs Loop Equation method.
b. Superposition Theorem method.
c. Delta-Star/Star-Delta Transformation method.
d. ThĂ©veninâs Theorem method.
5. define Kirchhoffâs âCurrent Lawâ and âVoltage Lawâ.
6. solve complex circuits using Kirchhoffâs âLoop Analysisâ method.
7. solve complex circuits, using the âSuperposition Theoremâ.
8. solve complex circuits, using the âDelta-Star/Star-Delta Transformationâ method.
9. solve complex circuits, using âThĂ©veninâs Theoremâ.
Introduction
In the companion book, An Introduction to Electrical Science, we learnt that electrical circuits are categorized according to the way in which their various components are connected relative to each other.
And we learnt that there are four such categories as shown in Figure 1.1. We also learnt that the term, âcomplex circuitâ, is nothing more than a category into which we can place any circuit that isnât connected in âseriesâ, âparallelâ, or âseriesparallelâ. Used in this context, then, the term âcomplexâ doesnât mean âcomplicatedâ, although many complex circuits are indeed complicated! âComplex circuitsâ are often referred to as ânetworksâ, so the analysis of complex circuits is often referred to as ânetwork analysisâ.
Figure 1.1
A basic example of a circuit within each of these categories is shown in Figures 1.2aâd. We need to bear in mind, however, that there are countless variations of the examples of series-parallel and complex connections having various degrees of difficulty.
We also learnt how to solve series, parallel, and series-parallel circuits. By âsolveâ, we mean determining the equivalent resistance of the circuit, as well as the currents through, and the voltage drops across, each of their components.
Unfortunately, the techniques we use to solve series, parallel, and series-parallel circuits cannot be used to solve complex circuits. Well ⊠this is only partly true, because we may need to use those techniques to simplify parts of a complex circuit,...
Table of contents
- Cover
- Half Title
- Title Page
- Copyright Page
- Dedication
- Table of Contents
- Foreword
- The author
- Introduction
- 1 Solving complex circuits: network theorems
- 2 Review of series and parallel a.c. circuits
- 3 Resolving phasors
- 4 Series-parallel a.c. circuits
- 5 Solving a.c. circuits using symbolic notation
- 6 Solving balanced and unbalanced three-phase circuits, using symbolic notation
- 7 Electrical measurements
- 8 Measuring three-phase power
- 9 Transformers 1: construction
- 10 Transformers 2: theory
- 11 Transformers 3: connections
- 12 D.C. generators
- 13 D.C. motors
- 14 Synchronous generators
- 15 Three-phase induction motors
- 16 Single-phase motors
- 17 A.C. motor starters
- 18 Electric lighting
- Index