# EASA Part 66  Module 3

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## Electrical Fundamentals (233 pages).

• EASA PART 66 Module 3 Online Exam:

Category A   –  Electrical Exams ( 20 questions 25 min),
Category B1 –  Electrical Exams ( 52 questions 65 min),
Category B2Electrical Exams ( 52 questions 65 min),
Category B3Electrical Exams ( 24 questions 30 min),

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• EASA PART 66 Module 3 in [French] click here.
EASA PART 66 MODULE 3

### Electron Theory

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

### 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.

### Electrical Terminology

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

### Generation of Electricity

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

### 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.

### DC Circuits

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

### Resistance/Resistor

#### Resistance and affecting factors;

• Specific resistance;
• Resistor color code, values and tolerances, preferred values, wattage ratings;
• Resistors in series and parallel;
• Calculation of total resistance using series, parallel and series parallel combinations;
• Operation and use of potentiometers and rheostats;
• Operation of Wheatstone bridge.

#### Positive and negative temperature coefficient conductance;

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

### Power

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

### 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 color coding;
• Calculations of capacitance and voltage in series and parallel circuits;
• Exponential charge and discharge of a capacitor, time constants;
• Testing of capacitors.

### Magnetism

#### Theory of magnetism;

• Properties of a magnet;
• Action of a magnet suspended in the Earth’s magnetic field;
• Magnetization and demagnetization;
• Magnetic shielding;
• Various types of magnetic material;
• Electromagnets construction and principles of operation;
• Hand clasp rules to determine: magnetic field around current carrying conductor.

#### Magneto motive force, field strength, magnetic flux density, permeability, hysteresis loop, retentively, coercive force reluctance, saturation point, eddy currents;

• Precautions for care and storage of magnets.

### Inductance/Inductor

• 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: magnetic field strength, rate of change of flux, number of conductor turns;
• Mutual induction;
• The effect the rate of change of primary current and mutual inductance has on induced voltage;
• Factors affecting mutual inductance: number of turns in coil, physical size of coil, permeability of coil, position of coils with respect to each other;
• Lenz’s Law and polarity determining rules;
• Back elf, self induction;
• Saturation point;
• Principle uses of inductors;

### 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 and direction of rotation of DC motors;
• Series wound, shunt wound and compound Motors’s
• Tarter Generator construction.

### AC Theory

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

### 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 LC and R circuits;
• Impedance, phase angle, power factor and current calculations;
• True power, apparent power and reactive power calculations.

### Transformers

• Transformer construction principles and operation;
• losses and methods for overcoming them;
• Transforme 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.

### Filters

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

### 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.

### AC Motors

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

#### EASA PART 66 Module 3 Online Exam:

Category A   –  Electrical Exams ( 20 questions 25 min),
Category B1 –  Electrical Exams ( 52 questions 65 min),
Category B2Electrical Exams ( 52 questions 65 min),
Category B3Electrical Exams ( 24 questions 30 min), 