Shared Flashcard Set

Details

AT 202 Electrical System
Unit 1- Electrical Systems
67
Aviation
Undergraduate 1
02/14/2014

Additional Aviation Flashcards

 


 

Cards

Term
Single Pole Single Throw Switch
Definition
One input one output
Term
Double Pole Single Throw
Definition
Two Inputs one output for each circuit
Term
Single Pole Double Throw
Definition
One input two outputs
Term
Push to make switch
Definition
closes circuit when pushed. returns to open (off) position
Term
Toggle Switches limited by:
Definition
No more than 2 throws, current limited by physical size
Term
Momentary contact switches
Definition
used for limit switches e.g. landing gear
Term
Relays:
Definition
Fixed core devices, LOW power
Term
Solenoids
Definition
Movable core devices: heavy duty
Term
Solenoids can be used to:
Definition
Control mechanical action
Term
Resistors:
Definition
Reduce current flow in a circuit, Convert elec. energy to heat
Term
Resistance is:
Definition
measured in Ohms
Term
Capacitors:
Definition
Store elect. energy: made up of metal plates which can store energy
Term
Capacitance is measured in:
Definition
farads
Term
Transformers:
Definition
Used to increase voltage in an AC Circuit: TWO coils (wall warts)
Term
Electrons:
Definition
small mass, NEGATIVELY charged
Term
Protons:
Definition
Positively charged, center of atom relatively large mass
Term
neutrons:
Definition
neutral charge same mass as proton
Term
Ion:
Definition
an atom with an excess or deficiency of electrons
Term
valance:
Definition
number of chemical bonds that can form in an atom
Determines if conductor or insulator
Term
Good Conductors:
Definition
copper, gold, silver Nearly EMPTY outer orbit
Term
Insulators:
Definition
No room for free electrons: Plastic air glass
Term
Semiconductors
Definition
Half outer orbit full: Silicon, arsenic
Term
Wire stripping:
Definition
a method to remove insulation from a wire
Term
AC 43.13 specifies?
Definition
How many nicks or broken strands are acceptable when stripping wire
Term
Soldering:
Definition
Joins two or more metals by melting and flowing a filler into the joint.
Term
Solder (substance)
Definition
A mixture of copper and tin- ratio varies
Term
Flux:
Definition
An agent used to prevent oxidization in the solder
Term
Voltage
Definition
Electrical pressure: VOLTS: Electromotive force
Term
Current
Definition
Electrical flow: AMPS
Term
Resistance
Definition
Opposition to flow: OHMS
Term
Polarity:
Definition
The location of the positive connection compared to the negative connection
Term
DC:
Definition
Current flows in one direction- linear
Term
Batteries Produce:
Definition
DC voltage
Term
AC
Definition
The polarity constantly changes- flows in one direction and REVERSES
Term
Frequency of AC voltage:
Definition
How often the current reverses, constant per system Measured in Hertz (HZ)
Term
Stationary sources of power produce:
Definition
AC voltage
Term
Brushless motors can be used with:
Definition
AC
Term
Aircraft engines are started with:
Definition
DC voltage from battery
Term
Three phase systems produce:
Definition
more power
Term
Current flows from:
Definition
Negative to Positive
Term
One Coulomb:
Definition
6.28 BILLION ELECTRONS: the current that will pass through a silver nitrate solution and will cause .0011 milligrams of silver to deposit on an electrode.
Term
One amp=
Definition
1 coulomb/ second
Term
Resistance is:
Definition
inversely proportional to current flow
Term
Magnet:
Definition
A material that attracts ferrous metals
Term
every magnet has:
Definition
two poles (North and South)
Term
Permanent Magnets:
Definition
Almost constant magnetic field
Term
Temporary:
Definition
The magnetic field changes under certain circumstances
Term
Magnetic Field:
Definition
The field of force existing between the poles of a magnet. called magnetic FLUX- has poles
Term
Electromagnetism:
Definition
The process of producing a magnetic field using an electric current. used in Relays, solenoids, motors
Term
Polarity of a magnetic field is determined by:
Definition
Direction of current flow
Term
Strength of a magnetic field is determined by:
Definition
STRENGTH of current, number of turns of the coi
Term
Left hand rule:
Definition
Learn it
Term
Electromagnetic induction:
Definition
When an electrical voltage/current produces magnetic fields and motion
Term
3 elements required for electromagnetic induction
Definition
1: conductor 2:Magnetic Field 3: Motion between magnetic field and conductor
Term
Left hand rule for generators:
Definition
determines voltage polarity of electrical power. - direction of current flow
Term
Factors influence amount of voltage/current
Definition
strength of magnetic field, number of coils: speed of motion between coils and magnet
Term
Battery:
Definition
one or more electromechanical cells that convert stored chemical energy into electrical energy:
Term
First batters:
Definition
Invented in 1800 called voltaic pile by Alesssandro Volta
Term
The net voltage of any cell is determined by:
Definition
chemical structure of the electrodes
Term
Primary Cells:
Definition
Not rechargeable, higher energy density- alkaline
Term
Secondary Cells:
Definition
rechargeable: lower energy density: good for high loads
Term
Wet Cells:
Definition
liquid electrolyte covers all internal parts: gasses are produced
Term
Dry Cell:
Definition
electrolyte is more of a paste, e.g zinc-carbon
Term
zinc-carbon batteries:
Definition
anode(negative)- zinc cathode(positive)-carbon electrolyte is ammonium chloride {1.5 volts}
Term
Gel Cells:
Definition
Low maintenance lead-acid battery doesn't need water ALSO called VERLA (valve regulated lead acid battery)
Term
sealed lead-acid batteries:
Definition
Gel cells- won't spill
Term
Most aircraft batteries are:
Definition
24 volts DC
Supporting users have an ad free experience!