# EASA Part 66 Module 3

## Electrical Fundamentals (233 pages).

EASA PART 66 MODULE 3

- EASA PART 66 Module 3 Online Exam:

Category A– Electrical Exams ( 20 questions 25 min),

Category B1– Electrical Exams ( 52 questions 65 min),

Category B2– Electrical Exams ( 52 questions 65 min),

Category B3– Electrical Exams ( 24 questions 30 min),

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### 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

- 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: 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 B2** – Electrical Exams ( 52 questions 65 min),

**Category B3** – Electrical Exams ( 24 questions 30 min),

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