Understandable Electric Circuits: Key concepts (2nd Edition)
In this digital age, as the role of electronic circuits becomes ever broader and more complex, a thorough understanding of the key concepts of circuits is a great advantage. This book offers a thorough reference guide to the theory, elements and design of basic electric circuits, providing a solid foundation for those who plan to move into the field of electronics engineering, and essential information for anyone who uses electric circuitry in their profession or research. The book is designed to be accessible to newcomers to the field while also providing a useful review for more advanced readers. It has been extensively revised and expanded for this new edition to provide a clear source of information on this complex topic. Materials are presented visually with less text and more outlines so that readers can quickly get to the heart of each topic, making studying and reviewing more effective.
Inspec keywords: computational electromagnetics; units (measurement); networks (circuits); circuit theory
Other keywords: mesh/node analysis; wye/delta circuits; inductor; mutual inductance/transformers; voltage/current divider rules; substitution theorems; resistor; units; transient analysis; Millman's theorems; Ohm's Law; circuit laws/rules; series/parallel circuits; resonance; capacitor; DC/AC circuits; threephase systems; branch current; maximum power transfer; impedance; magnetism; electromagnetism; dependent/independent sources; Thevenin's/ Norton's theorems; admittance; RLC circuits
Subjects: Education and training; General electrical engineering topics; Circuit theory; Measurement units; Electronic circuits
 Book DOI: 10.1049/PBCS047E
 Chapter DOI: 10.1049/PBCS047E
 ISBN: 9781785616976
 eISBN: 9781785616983
 Page count: 454
 Format: PDF

Front Matter
 + Show details  Hide details

p.
(1)

Quantities and units
 + Show details  Hide details

p.
1
–13
(13)
The chapter presents a review of basic math fundamentals. It discusses the quantities and units encountered in electric circuits, including SI units (International System of Units), scientific notation and engineering notation.

1 Basic concepts of electric circuits
 + Show details  Hide details

p.
15
–42
(28)
The book chapter presents an introduction to electric circuits by considering: electric circuits and schematic diagrams; electric current; electric voltage; resistance and Ohm's law and the reference direction of voltage and current.

2 Basic laws of electric circuits
 + Show details  Hide details

p.
43
–74
(32)
The book chapter presents the basic laws of electric circuits by considering: power and energy; Kirchhoff's voltage law; Kirchhoff's current law and voltage sources and current sources.

3 Series–parallel resistive circuits
 + Show details  Hide details

p.
75
–107
(33)
The book chapter studies seriesparallel resistive circuits by considering: series resistive circuits and voltage divider rule; parallel resistive circuits and current divider rule; specific seriesparallel resistive circuits; Wye (Y) and delta (Δ) configurations and their equivalent conversions.

4 Methods of DC circuit analysis
 + Show details  Hide details

p.
109
–135
(27)
The book chapter discusses methods of DC circuit analysis by considering: voltage source, current source, and their equivalent conversions; branch current analysis; mesh analysis and nodal voltage analysis.

5 The network theorems
 + Show details  Hide details

p.
137
–170
(34)
The scientists working in the field of the electrical engineering have developed more simplified theorems to analyze these kinds of complex circuits (the complicated circuit is also called the network). This chapter presents several theorems useful for analyzing such complex circuits or networks. These theorems include the superposition theorem, Thevenin's theorem, Norton's theorem, Millman's theorem, and the substitution theorem. In electric network analysis, the fundamental rules are still Ohm's law and Kirchhoff's laws.

6 Capacitors and inductors
 + Show details  Hide details

p.
171
–204
(34)
There are three important fundamental circuit elements: the resistor, capacitor, and inductor. The resistor (R) has been discussed in circuit analysis in the previous chapters. The other two elementsthe capacitor (C) and inductor (L) will be introduced in this chapter. The capacitor and inductor can store energy that has been absorbed from the power supply, and release it to the circuit. A capacitor can store energy in the electric field. An inductor can store energy in the magnetic field. A resistor consumes or dissipates electric energy. A circuit containing only resistors has limited applications. Practical electric circuits usually combine the above three basic elements and possibility along with other devices.

7 Transient analysis of circuits
 + Show details  Hide details

p.
205
–235
(31)
There are three basic elements in an electric circuit, the resistor R, capacitor C, and inductor L. The circuits in this chapter will combine the resistor(s) R with an energy storage element capacitor C or an inductor L to form an RL (resistorinductor) or RC (resistorcapacitor) circuit. These circuits exhibit the important behaviors that are fundamental to much of analogue electronics, and they are used very often in electric and electronic circuits. Analysis RL or RC circuits still use KCL and KVL. The main difference between RL or RC circuits and pure resistor circuits is that the pure resistor circuits can be analyzed by algebraic methods. The relationship of voltages and currents in the capacitor and inductor circuits is expressed by the derivative and differential equations (the equations with the derivative). RL or RC circuits that are described by the firstorder differential equations, or the circuits that include resistor(s), and only one single energy storage element (inductor or capacitor), are called the firstorder circuits.

8 Magnetism and electromagnetism
 + Show details  Hide details

p.
237
–254
(18)
Magnet is a piece of iron (or steel, alloy. ..) that has the ability to attract another metal object. Permanent magnet is a magnet that retains its magnetism over a long period of time after it is removed from a magnetic field. Magnetism is the attraction or repulsion properties of a magnet. A magnet has two areas of strongest force, called poles. Every magnet has a North and South Pole (N and S). The basic law of magnet: Like poles repel, unlike poles attract. Magnetic field is a place near a magnet or a moving electric charge where magnetic properties are produced (an invisible area of magnetism produced by moving the electric charge). Electromagnetic force is a force between charged objects around their electric and magnetic fields. Magnetic field lines (the lines of force) around a magnet describe the directions of the magnetic field (they can be plotted with iron filings and paper). Outside: the magnetic field lines travel from the North Pole (N) to the South Pole (S). Inside: from the South Pole to the North Pole.

9 Fundamentals of AC circuits
 + Show details  Hide details

p.
255
–294
(40)
The DC (direct current) power supply provides a constant voltage and current, hence all resulting voltages and currents in DC circuit are constant and do not change with time. The polarity of DC voltage and direction of DC current do not change, only their magnitude changes. Before the nineteenth century, the DC power supply was the main form of electrical energy to provide electricity. An alternating voltage is called AC (alternating current) voltage and alternating current is called AC current. The AC voltage alternates its polarity and the AC current alternates its direction periodically. Since the AC power supply provides an alternating voltage and current, the resulting currents and voltages in AC circuit also periodically switch their polarities and directions. In the nineteenth century, DC and AC have had constant competition, AC gradually showed its advantages and rapidly developed in the latter of the nineteenth century, and is still commonly used in current industries, businesses, and homes throughout the world. This is because the AC power can be more costeffective for longdistance transmission from power plants to industrial, commercial, or residential areas. This is why power transmission for electricity today is nearly all AC. It is also easy to convert from AC to DC, allowing for a wide range of applications.

10 Methods of AC circuit analysis
 + Show details  Hide details

p.
295
–338
(44)
This chapter outlines: Impedance and admittance; Impedance in series and parallel circuits; Power in AC circuits and Methods of analyzing AC circuits.

11 RLC circuits and resonance
 + Show details  Hide details

p.
339
–364
(26)
The chapter begins by discussing series resonance, and goes on to consider bandwidth and selectivity, and parallel resonance. The chapter concludes by presenting a practical parallel resonant circuit.

12 Mutual inductance and transformers
 + Show details  Hide details

p.
365
–383
(19)
The chapter begins with a discussion of mutual inductance, and goes on to consider a basic transformer together with stepup and stepdown transformers. The chapter concludes with a discussion of impedance matching.

13 Circuits with dependent sources
 + Show details  Hide details

p.
385
–397
(13)
The chapter begins with a discussion of dependent sources, including an introduction, the different types, equivalent conversion, and circuits with dependent sources. It goes on to discuss their analysis using Kirchoff's Voltage Law, Kirchoff's Current Law, node voltage, mesh current, superposition theorem, and Thevenin's theorem.

14 Threephase systems
 + Show details  Hide details

p.
399
–413
(15)
The chapter begins with a discussion of threephase circuits and the analysis of threephase sources. It goes on to consider the analysis of YY and YΔ systems, and concludes by discussing power in balanced threephase systems.

Appendix A Greek alphabets
 + Show details  Hide details

p.
415
(1)

Appendix B Differentiation of the phasor
 + Show details  Hide details

p.
417
(1)

Back Matter
 + Show details  Hide details

p.
(1)