NCATT (AET) EXAM STUDY GUIDE
QUESTIONS WITH CORRECT ANSWERS
Ampere |( |A, |amp, |amperage) |- |ANSWER • |Unit |of |measurement |used |to |express
the |flow |of |electrons |(electrical |current)
• One |ampere |is |a |rate |of |flow |of |one |coulomb |(6.28 |billion |- |billion |electrons)
|passing |a |given |point |in |an |electrical |circuit |per |second
• In |mathematical |problems |amperage |is |expressed |by |the |letter |"I"
Battery |- |ANSWER • |A |device |consisting |of |a |number |of |primary |voltaic |cells |(cells
|that |cannot |be |recharged) |or |secondary |cells |(cells |that |can |be |recharged)
|connected |in |series |to |obtain |a |desired |DC |voltage
• A |battery |stores |chemical |energy |and |converts |the |energy |into |electrical |form
• Aircraft |storage |batteries |are |generally |rated |at |12 |or |24 |volts
Capacitor |- |ANSWER • |Electrical |device |used |to |store |charge |and |energy |in |the
form |of |an |electrostatic |field
• A |capacitor |is |a |device |made |of |two |parallel |conductors |separated |by |an |insulator
Conductor |- |ANSWER • |Common |building |block |of |electrical |circuits |that |easily
|permits |the |movement |of |electrons |from |an |electrical |source |to |a |load |and |back |to
|the |electrical |source |with |a |minimum |of |resistance.
• A |conductor's |resistance |depends |on |such |factors |as |cross |sectional |area, |length,
|temperature, |and |conductor |material.
Coulomb |- |ANSWER • |Basic |unit |of |electrical |quantity.
• A |coulomb |is |equal |to |6.28 |billion |- |billion |electrons |(6.28 |x |10 |to |the |18th)
Current |- |ANSWER • |The |flow |of |electrons |through |a |conductor |is |known |as
|current |flow.
• The |rate |of |current |flow |is |measured |in |amperes.
Direct |Current |(DC) |- |ANSWER • |A |flow |of |electrons |in |one |direction |throughout
,an |electric |circuit |with |constant |voltage |and |current.
• Direct |current |is |caused |by |a |constant |difference |of |potential, |both |negative |and
|positive.
Electron |- |ANSWER • |Negatively |charged |subatomic |particles |that |are |located |and
|travel |around |(orbit) |the |nucleus |in |an |imaginary |sphere |or |shell |at |the |speed |of
|light |(186,000 |miles/second)
• Electrons |are |involved |in |the |conduction |of |electricity.
EMF |(electromotive |force) |- |ANSWER • |The |force |that |causes |electrons |to |flow
through |a |conductor.
• This |force |is |abbreviated |e.m.f.
• The |unit |of |measurement |for |eletromotive |force |is |the |volt.
• In |mathematical |problems |voltage |is |expressed |by |the |letter |"E".
Farad |- |ANSWER
| • |Basic |unit |of |capacitance
• One |farad |holds |one |coulomb |under |a |pressure |of |one |volt.
Henry |(H) |- |ANSWER • |Basic |unit |of |measurement |for |inductance |of |an |electrical
coil
• One |(1) |henry |is |the |inductance |of |a |coil |when |a |change |of |current |of |one |(1)
|ampere |per |second |induces |an |e.m.f. |of |one |(1) |volt
• In |mathematical |problems |inductance |is |expressed |by |the |symbol |"L".
Inductor |- |ANSWER • |Coil |or |other |device |used |to |introduce |inductance |into |a
|circuit.
• An |inductor |is |a |winding, |or |coiling, |of |multiple |turns |of |wire
Insulator |- |ANSWER • |Material |or |device |used |to |prevent |the |passage |of |heat,
electricity, |or |sound |from |one |medium |to |another.
Left |hand |rule |- |ANSWER
| • |Refers |to |electrical
• This |rule |is |for |determining |the |direction |of |movement |of |a |current |- |carrying
|conductor |in |a |magnetic |field
,Magnetic |Permeability |- |ANSWER • |Measure |of |ease |that |lines |of |flux |travel
through |a |material
Magnetism |- |ANSWER • |Ability |of |a |magnet |to |attract |certain |materials
|containing |iron |and |to |influence |electrons
• Magnetism |is |the |principle |way |to |effectively |produce |AC |electricity
Metric |Prefixes |- |ANSWER • |Measurements |relating |or |using |the |metric |system |of
measurement
Neutron |- |ANSWER • |Neutral |subatomic |particles |that |exist |within |the |nucleus |of
all |atoms
• Neutrons |are |not |involved |in |the |conduction |of |electricity
Ohm |- |ANSWER • |Unit |of |electrical |opposition |to |the |flow |of |current
• A |circuit |has |one |ohm |of |resistance |when |it |limits |the |flow |of |current |to |one |amp
|under |a |voltage |pressure |of |one |volt
Ohm's |Law |- |ANSWER • |Ohm's |Law |states |"the |amount |of |current |flowing |in |a
|circuit |is |directly |proportional |to |the |circuit |voltage |and |inversely |proportional |to
|the |circuit |resistance"
• A |plain |language |statement |for |Ohm's |Law |is; |One |volt |causes |one |ampere |to |flow
through |a |resistance |of |one |ohm.
Proton |- |ANSWER • |Positively |charged |subatomic |particles |that |exist |within |the
nucleus |of |all |atoms
• Protons |are |not |involved |in |the |conduction |of |electricity
Resistance |(R) |- |ANSWER • |Electrical |characteristic |of |a |conductor
• Opposition |that |a |circuit, |component, |or |substance |presents |to |flow |of |electricity
• Resistance |is |the |force |that |opposes |or |slows |down |another |force, |drops |voltage,
|and |consumes |power
• Resistance |is |measured |in |ohms
, • In |mathematical |problems |ohms |of |resistance |is |expressed |by |symbol |"R"
Scientific |Notation |- |ANSWER | | • |Short |way |of |expressing |a |given |number |between
|1 |and |10 |multiplied |by |10 |to |the |appropriate |power
Static |Electricity |- |ANSWER • |Electrical |charge |that |may |be |built |up |on |a
non-conductive |surface |by |friction
• Static |electricity |serves |no |useful |purpose
Volt |(V) |- |ANSWER • |Basic |unit |of |electrical |pressure
• A |volt |is |the |amount |of |force |required |to |cause |one |amp |of |current |to |flow
through |one |ohm |or |resistance
• Volt |is |often |expressed |by |such |terms |as |voltage, |voltage |drop, |potential
difference, |EMF, |or |IR |drop
Watts |(W) |- |ANSWER • |Basic |unit |of |power |that |is |the |product |of |voltage
multiplied |by |current
• One |watt |is |power |po
produced |in |a |circuit |that |has |one |amp |of |current |flowing |under |a |pressure |of |one
|volt
Working |Voltage |- |ANSWER | • |Maximum |amount |of |DC |voltage |that |can |be |safely
|applied |across |a |capacitor
Alternating |Current |(AC) |- |ANSWER • |Flow |of |electrons |that |continuously
changes |it |value |in |magnitude |and |periodically |reverses |direction |(sine-wave)
• Alternating |current |is |much |easier |to |produce |in |large |quantities |as |compared |to
|DC. |The |time |required |for |one |cycle |of |AC |to |occur |is |called |the |period
Apparently |Power |- |ANSWER | • |Product |of |effective |voltage |and |effective |current
|which |is |expressed |in |Volt |Amps |(VA) |rather |than |Watts |(W) |without |reference |to
|phase |shift, |if |any, |between |voltage |and |current
Capacitive |Reactance |(XC) |- |ANSWER • |Opposition |to |current |flow |in |a |circuit
• The |affect |that |capacitance |has |on |an |AC |circuit |to |lead |voltage |in |phase |(ICE)
• Values |are |given |in |ohms
Delta |Wound |- |ANSWER • |Windings |arranged |in |the |shape |of |a |triangle
QUESTIONS WITH CORRECT ANSWERS
Ampere |( |A, |amp, |amperage) |- |ANSWER • |Unit |of |measurement |used |to |express
the |flow |of |electrons |(electrical |current)
• One |ampere |is |a |rate |of |flow |of |one |coulomb |(6.28 |billion |- |billion |electrons)
|passing |a |given |point |in |an |electrical |circuit |per |second
• In |mathematical |problems |amperage |is |expressed |by |the |letter |"I"
Battery |- |ANSWER • |A |device |consisting |of |a |number |of |primary |voltaic |cells |(cells
|that |cannot |be |recharged) |or |secondary |cells |(cells |that |can |be |recharged)
|connected |in |series |to |obtain |a |desired |DC |voltage
• A |battery |stores |chemical |energy |and |converts |the |energy |into |electrical |form
• Aircraft |storage |batteries |are |generally |rated |at |12 |or |24 |volts
Capacitor |- |ANSWER • |Electrical |device |used |to |store |charge |and |energy |in |the
form |of |an |electrostatic |field
• A |capacitor |is |a |device |made |of |two |parallel |conductors |separated |by |an |insulator
Conductor |- |ANSWER • |Common |building |block |of |electrical |circuits |that |easily
|permits |the |movement |of |electrons |from |an |electrical |source |to |a |load |and |back |to
|the |electrical |source |with |a |minimum |of |resistance.
• A |conductor's |resistance |depends |on |such |factors |as |cross |sectional |area, |length,
|temperature, |and |conductor |material.
Coulomb |- |ANSWER • |Basic |unit |of |electrical |quantity.
• A |coulomb |is |equal |to |6.28 |billion |- |billion |electrons |(6.28 |x |10 |to |the |18th)
Current |- |ANSWER • |The |flow |of |electrons |through |a |conductor |is |known |as
|current |flow.
• The |rate |of |current |flow |is |measured |in |amperes.
Direct |Current |(DC) |- |ANSWER • |A |flow |of |electrons |in |one |direction |throughout
,an |electric |circuit |with |constant |voltage |and |current.
• Direct |current |is |caused |by |a |constant |difference |of |potential, |both |negative |and
|positive.
Electron |- |ANSWER • |Negatively |charged |subatomic |particles |that |are |located |and
|travel |around |(orbit) |the |nucleus |in |an |imaginary |sphere |or |shell |at |the |speed |of
|light |(186,000 |miles/second)
• Electrons |are |involved |in |the |conduction |of |electricity.
EMF |(electromotive |force) |- |ANSWER • |The |force |that |causes |electrons |to |flow
through |a |conductor.
• This |force |is |abbreviated |e.m.f.
• The |unit |of |measurement |for |eletromotive |force |is |the |volt.
• In |mathematical |problems |voltage |is |expressed |by |the |letter |"E".
Farad |- |ANSWER
| • |Basic |unit |of |capacitance
• One |farad |holds |one |coulomb |under |a |pressure |of |one |volt.
Henry |(H) |- |ANSWER • |Basic |unit |of |measurement |for |inductance |of |an |electrical
coil
• One |(1) |henry |is |the |inductance |of |a |coil |when |a |change |of |current |of |one |(1)
|ampere |per |second |induces |an |e.m.f. |of |one |(1) |volt
• In |mathematical |problems |inductance |is |expressed |by |the |symbol |"L".
Inductor |- |ANSWER • |Coil |or |other |device |used |to |introduce |inductance |into |a
|circuit.
• An |inductor |is |a |winding, |or |coiling, |of |multiple |turns |of |wire
Insulator |- |ANSWER • |Material |or |device |used |to |prevent |the |passage |of |heat,
electricity, |or |sound |from |one |medium |to |another.
Left |hand |rule |- |ANSWER
| • |Refers |to |electrical
• This |rule |is |for |determining |the |direction |of |movement |of |a |current |- |carrying
|conductor |in |a |magnetic |field
,Magnetic |Permeability |- |ANSWER • |Measure |of |ease |that |lines |of |flux |travel
through |a |material
Magnetism |- |ANSWER • |Ability |of |a |magnet |to |attract |certain |materials
|containing |iron |and |to |influence |electrons
• Magnetism |is |the |principle |way |to |effectively |produce |AC |electricity
Metric |Prefixes |- |ANSWER • |Measurements |relating |or |using |the |metric |system |of
measurement
Neutron |- |ANSWER • |Neutral |subatomic |particles |that |exist |within |the |nucleus |of
all |atoms
• Neutrons |are |not |involved |in |the |conduction |of |electricity
Ohm |- |ANSWER • |Unit |of |electrical |opposition |to |the |flow |of |current
• A |circuit |has |one |ohm |of |resistance |when |it |limits |the |flow |of |current |to |one |amp
|under |a |voltage |pressure |of |one |volt
Ohm's |Law |- |ANSWER • |Ohm's |Law |states |"the |amount |of |current |flowing |in |a
|circuit |is |directly |proportional |to |the |circuit |voltage |and |inversely |proportional |to
|the |circuit |resistance"
• A |plain |language |statement |for |Ohm's |Law |is; |One |volt |causes |one |ampere |to |flow
through |a |resistance |of |one |ohm.
Proton |- |ANSWER • |Positively |charged |subatomic |particles |that |exist |within |the
nucleus |of |all |atoms
• Protons |are |not |involved |in |the |conduction |of |electricity
Resistance |(R) |- |ANSWER • |Electrical |characteristic |of |a |conductor
• Opposition |that |a |circuit, |component, |or |substance |presents |to |flow |of |electricity
• Resistance |is |the |force |that |opposes |or |slows |down |another |force, |drops |voltage,
|and |consumes |power
• Resistance |is |measured |in |ohms
, • In |mathematical |problems |ohms |of |resistance |is |expressed |by |symbol |"R"
Scientific |Notation |- |ANSWER | | • |Short |way |of |expressing |a |given |number |between
|1 |and |10 |multiplied |by |10 |to |the |appropriate |power
Static |Electricity |- |ANSWER • |Electrical |charge |that |may |be |built |up |on |a
non-conductive |surface |by |friction
• Static |electricity |serves |no |useful |purpose
Volt |(V) |- |ANSWER • |Basic |unit |of |electrical |pressure
• A |volt |is |the |amount |of |force |required |to |cause |one |amp |of |current |to |flow
through |one |ohm |or |resistance
• Volt |is |often |expressed |by |such |terms |as |voltage, |voltage |drop, |potential
difference, |EMF, |or |IR |drop
Watts |(W) |- |ANSWER • |Basic |unit |of |power |that |is |the |product |of |voltage
multiplied |by |current
• One |watt |is |power |po
produced |in |a |circuit |that |has |one |amp |of |current |flowing |under |a |pressure |of |one
|volt
Working |Voltage |- |ANSWER | • |Maximum |amount |of |DC |voltage |that |can |be |safely
|applied |across |a |capacitor
Alternating |Current |(AC) |- |ANSWER • |Flow |of |electrons |that |continuously
changes |it |value |in |magnitude |and |periodically |reverses |direction |(sine-wave)
• Alternating |current |is |much |easier |to |produce |in |large |quantities |as |compared |to
|DC. |The |time |required |for |one |cycle |of |AC |to |occur |is |called |the |period
Apparently |Power |- |ANSWER | • |Product |of |effective |voltage |and |effective |current
|which |is |expressed |in |Volt |Amps |(VA) |rather |than |Watts |(W) |without |reference |to
|phase |shift, |if |any, |between |voltage |and |current
Capacitive |Reactance |(XC) |- |ANSWER • |Opposition |to |current |flow |in |a |circuit
• The |affect |that |capacitance |has |on |an |AC |circuit |to |lead |voltage |in |phase |(ICE)
• Values |are |given |in |ohms
Delta |Wound |- |ANSWER • |Windings |arranged |in |the |shape |of |a |triangle
