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Module 3. Electrical fundamentals (Part-66)

Module 3. Electrical fundamentals (Part-66)

Duration

100 hours training

Number of Participants

None.

Price

None.

Content

Content: Part-66 Module 3. Electrical fundamentals

 

1. Electron Theory

  • Structure and distribution of electrical charges within: atoms, molecules,ions, compounds;
  • Molecular structure of conductors, semiconductors and insulators.

2. Static Electricity and Conduction

  • Static electricity and distribution of electrostatic charges;
  • Electrostatic laws of attraction and repulsion;
  • Units of charge, Coulomb's Law;
  • Conduction of electricity in solids, liquids, gases and a vacuum.

3. Electrical Terminology

  • The following terms, their units and factors affecting them: potentialdifference, electromotive force, voltage, current, resistance, conductance,charge, conventional current flow, electron flow.

4. Generation of Electricity

  • Production of electricity by the following methods: light, heat, friction,pressure, chemical action, magnetism and motion.

5. DC Sources of Electricity

  • Construction and basic chemical action of: primary cells, secondary cells,lead acid cells, nickel cadmium cells, other alkaline cells;
  • Cells connected in series and parallel;
  • Internal resistance and its effect on a battery;
  • Construction, materials and operation of thermocouples;
  • Operation of photo-cells.

6. DC Circuits

  • Ohms Law, Kirchoff's Voltage and Current Laws;
  • Calculations using the above laws to find resistance, voltage and current;
  • Significance of the internal resistance of a supply.

7. Resistance/Resistor

7.1 Resistance and affecting factors;

  • Specific resistance;
  • Resistor colour code, values and tolerances, preferred values, wattageratings;
  • Resistors in series and parallel;
  • Calculation of total resistance using series, parallel and seriesparallel combinations;
  • Operation and use of potentiometers and rheostats;
  • Operation of Wheatstone Bridge.

7.2 Positive and negative temperature coefficientconductance;

  • Fixed resistors, stability, tolerance and limitations,methods of construction;
  • Variable resistors, thermistors, voltage dependentresistors;
  • Construction of potentiometers and rheostats;
  • Construction of Wheatstone Bridge;

8. Power

  • Power, work and energy (kinetic and potential);
  • Dissipation of power by a resistor;Power formula;
  • Calculations involving power, work and energy.

9. Capacitance / Capacitor

  • Operation and function of a capacitor;
  • Factors affecting capacitance area of plates, distance between plates,number of plates, dielectric and dielectric constant, working voltage,voltage rating;
  • Capacitor types, construction and function;
  • Capacitor colour coding;
  • Calculations of capacitance and voltage in series and parallel circuits;
  • Exponential charge and discharge of a capacitor, time constants;
  • Testing of capacitors.

10. Magnetism

10.1 Theory of magnetism;

  • Properties of a magnet;
  • Action of a magnet suspended in the Earth's magnetic field;
  • Magnetisation and demagnetisation;
  • Magnetic shielding;
  • Various types of magnetic material;
  • Electromagnets construction and principles of operation;
  • Hand clasp rules to determine: magnetic field around current carryingconductor.

10.2 Magnetomotive force, field strength, magnetic flux density, permeability,hysteresis loop, retentivity, coercive force reluctance, saturation point,eddy currents;

  • Precautions for care and storage of magnets.

11. Inductance/Inductor

  • Faraday's Law;
  • Action of inducing a voltage in a conductor moving in a magnetic field;
  • Induction principles;
  • Effects of the following on the magnitude of an induced voltage: magneticfield strength, rate of change of flux, number of conductor turns;
  • Mutual induction;
  • The effect the rate of change of primary current and mutual inductancehas on induced voltage;
  • Factors affecting mutual inductance: number of turns in coil, physical sizeof coil, permeability of coil, position of coils with respect to each other;
  • Lenz's Law and polarity determining rules;
  • Back emf, self induction;
  • Saturation point;
  • Principle uses of inductors;

12. DC Motor / Generator Theory

  • Basic motor and generator theory;
  • Construction and purpose of components in DC generator;
  • Operation of, and factors affecting output and direction of current flow in DC generators;
  • Operation of, and factors affecting output power, torque, speed anddirection of rotation of DC motors;
  • Series wound, shunt wound and compound motors;S
  • tarter Generator construction.

13. AC Theory

  • Sinusoidal waveform: phase, period, frequency, cycle;
  • Instantaneous, average, root mean square, peak, peak to peak currentvalues and calculations of these values, in relation to voltage, current andpower Triangular / Square waves;
  • Single / 3 phase principles.

14. Resistive (R), Capacitive (C) and Inductive (L) Circuits

  • Phase relationship of voltage and current in L, C and R circuits, parallel,series and series parallel;
  • Power dissipation in L, C and R circuits;
  • Impedance, phase angle, power factor and current calculations;
  • True power, apparent power and reactive power calculations.

15. Transformers

  • Transformer construction principles and operation;
  • Transformer losses and methods for overcoming them;
  • Transformer action under load and no-load conditions;
  • Power transfer, efficiency, polarity markings;
  • Calculation of line and phase voltages and currents;
  • Calculation of power in a three phase system;
  • Primary and Secondary current, voltage, turns ratio, power, efficiency;
  • Auto transformers.

16. Filters

  • Operation, application and uses of the following filters: low pass, highpass, band pass, band stop.

17. AC Generators

  • Rotation of loop in a magnetic field and waveform produced;
  • Operation and construction of revolving armature and revolving field type AC generators;
  • Single phase, two phase and three phase alternators;
  • Three phase star and delta connections advantages and uses;
  • Permanent Magnet Generators.

18. AC Motors

  • Construction, principles of operation and characteristics of: AC synchronous and induction motors both single and polyphase;
  • Methods of speed control and direction of rotation;
  • Methods of producing a rotating field: capacitor, inductor, shaded or splitpole.

Objectives

None.

Target Group

None.

Aircraft Engine

None.

Prerequisites

None.

Examination

None.

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