Manuals for technical schools in electronics. Short course of lectures on electrical engineering (correspondence department) - file n1.doc

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n1.doc

Short course of lectures

in electrical engineering (correspondence department)

Introduction

1. 
   Key Definitions
   1.1. Key Explanations and Terms
   1.2. Passive equivalent circuit elements
   1.3. Active elements of the equivalent circuit
   1.4. Basic schema definitions
   1.5. Modes of operation of electrical circuits
   1.6. Basic laws of electrical circuits
2. 
   Equivalent transformations of circuits. Parallel connection of electrical circuit elements
   2.1. Serial connection of electrical circuit elements
   2.2. Parallel connection of electrical circuit elements
3. 
   
   3.1. Calculation of DC electrical circuits
   single source coagulation method
4. 
   
   4.1. The method of direct application of the laws of Kirchhoff
   4.2. Loop current method
   4.3. The method of nodal potentials
5. 
   Nonlinear DC Circuits
   5.1. Key Definitions
   5.2. Graphic method for calculating non-linear DC circuits
6. 
   Single phase AC electrical circuits
   6.1. Key Definitions
   6.2. Image of sinusoidal functions of time in vector form
   6.3. Image of sinusoidal functions of time in complex form
   6.4. Impedance in the sinusoidal current circuit
   6.5. Inductive coil in a sinusoidal current circuit
   6.6. Capacitance in the sinusoidal current circuit
   6.7. Series-connected real inductive
   sinusoidal coil and capacitor
   6.8. Parallel connected inductance, capacitance and
   active resistance in a sinusoidal current circuit
   6.9. Resonant mode in a circuit consisting of parallel
   included real inductive coil and capacitor
   6.10. Sine current power
7. 
   Three phase circuit
   7.1. Key Definitions
   7.2. Connection to the star. Scheme, definitions.
   7.3. Connection to the triangle. Scheme, definitions
   7.5. Three-phase power
8. 
   Magnetic circuits
   9.1. Key Definitions
   9.2. Properties of ferromagnetic materials
   9.3. Magnetic Circuit Design
9. 
   Transformers
   10.1. Transformer design
   10.2. Transformer idling
   10.3. Transformer operation under load
10. 
    Electric DC Machines
    11.1. The device of an electric DC machine
    11.2. The principle of operation of a DC machine
    11.3. The operation of an electric DC machine
    in generator mode
    11.4. Independently excited generators.
    Generator Characteristics
    11.5. Self-excited generators.
    The principle of self-excitation of a generator with parallel excitation
    11.6. The operation of an electric DC machine
    in engine mode. Basic equations
    11.7. Mechanical characteristics of electric motors
    direct current
11. 
    Electric AC Machines
    12.1. Rotating magnetic field
    12.2. Induction motors. Design, principle of operation
    12.3. Asynchronous Motor Torque
    12.4. Speed \u200b\u200bcontrol of induction motors.
    Reversing induction motor
    12.5. Single Phase Induction Motors
    12.6. Synchronous motors.
    Design, principle of operation

List of references

Introduction

  Electrical engineering - a branch of science and technology related to the use of electrical and magnetic phenomena for energy conversion, processing of materials, information transfer, etc.
  Electrical engineering covers the issues of obtaining, converting and using electricity in practical human activities. Electricity can be obtained in significant quantities, transferred to a distance and easily converted to other types of energy.
  In a short course of lectures, the basic definitions and topological parameters of electrical circuits are given, methods for calculating linear and non-linear DC and AC circuits, analysis and calculation of magnetic circuits are described.
  The design, operation principle and characteristics of transformers and electric machines of direct and alternating current, as well as information electric machines, are considered.

1. Basic definitions

1.1. Key Explanations and Terms

  Electrical engineering is a field of science and technology that studies electrical and magnetic phenomena and their use for practical purposes.
  An electric circuit is a collection of devices designed for the production, transmission, conversion and use of electric current.
  All electrical devices according to purpose, principle of operation and design can be divided into three groups:

1. 
   Sources of energy, i.e. devices generating electric current (generators, thermocouples, photocells, chemical elements).
2. 
   Receivers, or load, i.e. devices consuming electric current (electric motors, electric lamps, electromechanisms, etc.).
3. 
   Conductors, as well as various switching equipment (switches, relays, contactors, etc.).

  The directional movement of electric charges is called electric current. An electric current may occur in a closed electrical circuit. An electric current, the direction and magnitude of which is constant, is called permanent   current and are denoted by the capital letter I.
  An electric current, the magnitude and direction of which does not remain constant, is called variables   electric shock. The value of alternating current at the moment in time is called instantaneous and is denoted by the lowercase letter i.

For the operation of the electrical circuit requires the presence of energy sources.
  There are active and passive circuits, sections and circuit elements. Active are electrical circuits containing energy sources, passive are electrical circuits that do not contain energy sources.

An electric circuit is called linear if not a single parameter of the circuit depends on the magnitude or direction of the current or voltage.
  An electric circuit is non-linear if it contains at least one non-linear element. The parameters of nonlinear elements depend on the magnitude or direction of the current or voltage.

An electrical circuit is a graphic representation of an electrical circuit that includes device conventions and shows the connection of these devices. In fig. 1.1 shows an electrical diagram of a circuit consisting of an energy source, electric lamps 1 and 2, electric motor 3.

Fig. 1.1

To facilitate analysis, the electrical circuit is replaced by an equivalent circuit.
  Equivalent circuit   - This is a graphic image of an electric circuit using ideal elements, the parameters of which are the parameters of the replaced elements.

Figure 1.2 shows the equivalent circuit.

Fig. 1.2

In this section, to your attention are provided Books on Electronics and Electrical Engineering. Electronics is a science that studies the interaction of electrons with electromagnetic fields and the development of methods for creating electronic devices, devices or elements used mainly for the transmission, processing and storage of information.

Electronics is a booming branch of science and technology. She studies the physical foundations and practical application of various electronic devices. Physical electronics include: electronic and ionic processes in gases and conductors. At the interface between vacuum and gas, solid and liquid bodies. Technical electronics include the study of electronic devices and their application. The area devoted to the use of electronic devices in industry is called Industrial Electronics.

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