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AGK - Electrics 1 Introduction S1

1) Aircraft electrical systems generate and distribute electrical power for electronic devices and controls. Power systems vary from 14V DC in small aircraft to 115/200V AC in modern jets. 2) An electric current is produced when electrons flow through a conductor, and only flow in one direction in a direct current (DC) circuit. Alternating current (AC) changes direction periodically. 3) Atoms are made up of protons, electrons, and neutrons. Electrons surrounding the atomic nucleus can move between atoms in conductors, enabling electric current flow.

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110 views11 pages

AGK - Electrics 1 Introduction S1

1) Aircraft electrical systems generate and distribute electrical power for electronic devices and controls. Power systems vary from 14V DC in small aircraft to 115/200V AC in modern jets. 2) An electric current is produced when electrons flow through a conductor, and only flow in one direction in a direct current (DC) circuit. Alternating current (AC) changes direction periodically. 3) Atoms are made up of protons, electrons, and neutrons. Electrons surrounding the atomic nucleus can move between atoms in conductors, enabling electric current flow.

Uploaded by

Cemalettin öztoprak
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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AGK Electrics

Lesson 1: Introduction and Basic Principles


Aircraft Electrical System
• Electrics is about the creation, distribution and
storage of power.
• Electronic devices need electrical power in order to
function and electrical systems will require electronic
systems for control purposes.
• Generates electrical energy to be used by
components
• Light training aircraft 14 volt DC system
• Larger twin turbine aircraft 28 volt DC system
• Modern jet airliner 115/200 V AC system
Electrical Currents
• An electric current is produced when electrons are
encouraged to flow through a conductor.
• Current flow when circuit is complete or closed
• One direction only is direct current or DC.
• When electrons first move one way and then back
the other way is alternating current or AC.
• Direct current - one direction
• Alternating current - changes direction
The Atom
• An electron is part of an atom. Every
substance we know of is made up of a
number of atoms, different materials
having different make up of their
atoms.
• An atom consists of Protons (which
have a positive charge) Electrons
(which have a negative charge) and
Neutrons which have no charge.
The Atom
• Each atom has the same number of
electrons as protons therefore making
the atom electrically neutral.
• Electrons surround the nucleus may be
encouraged to move from atom to atom
referred to as ‘free electrons’
• Electrons which resist movement
between atoms are referred to as
insulators.
• Electrons that can be moved from atom
to atom through the structure are
referred to as conductors.
Materials
• Insulators - bound electrons resist
movement
• Conductors - movable electrons
• Semiconductors act like an insulator but
after processing can be made to act like a
conductor.
The Driving Force
• Battery supplies energy to push electrons
through a closed circuit
Electromotive Force
• Battery has two electrodes separated by an electrolyte.
• Contains many ions.
• Very electrically conductive
Chemical reaction removes electrons from one
electrode and adds them to the other.
Negatively charged electrons in the conductor are
attracted towards the positive terminal.
Produces a positive terminal and a negative terminal.
Electromotive Force
• The difference in charge between the two
electrodes is the electrical potential.
• Provides the motive force to move electrons around
the circuit
• Closed circuit – current flows, open circuit – no
current flows.
• Negative to positive is called ‘electron flow’
assumed flow from positive to negative
‘conventional flow’

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