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### Electrical fundamentals (module 3)

Electrical Fundamentals (EASA part 66 Module 3) covers various sections of Electrical engineering subjects to to meet the Electrical engineering knowledge requirements for a certifying Aircraft Technician. Browse Down to find out the knowledge requirements for Electrical Fundamentals (EASA part 66 Module 3).

## Electrical fundamentals (EASA part 66 Module 3) Model Questions

#### 3.1 Electron Theory

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

#### 3.2 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.

#### 3.3 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.

#### 3.4 Generation of Electricity

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

#### 3.5 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.

#### 3.6 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.

#### 3.7 Resistance/Resistor

(a)
Resistance and affecting factors;
Specific resistance;
Resistor colour 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.
(b)
Positive and negative temperature coefficient conductance;
Fixed resistors, stability, tolerance and limitations, methods of construction;
Variable resistors, thermistors, voltage dependent resistors;
Construction of potentiometers and rheostats;
Construction of Wheatstone Bridge;

#### 3.8 Power

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

#### 3.9 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.

#### 3.10 Magnetism

(a)
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 carrying conductor.
(b)
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.

#### 3.11 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 emf, self induction;
Saturation point;
Principle uses of inductors;

#### 3.12 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 and direction of rotation of DC motors;
Series wound, shunt wound and compound motors;
Starter Generator construction.

#### 3.13 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.

#### 3.14 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.

#### 3.15 Transformers

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

#### 3.16 Filters

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

#### 3.17 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.

#### 3.18 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 split pole.
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