NCATT AET Actual Exam 2025–2026 – Complete Certification Review, Definitions, and Practice Material

NCATT AET ActualExam 2025–2026 – Complete Certification Review, Definitions, and Practice Material


Ampere( A, amp,amperage)- ANSWER • Unit of measurementusedto express
theflowof electrons(electricalcurrent)

• One ampereis a rateof flowof onecoulomb(6.28billion - billion electrons)passinga given
point in an electricalcircuit per second

• In mathematicalproblemsamperageis expressedby theletter"I"

Battery- ANSWER • A deviceconsistingof a number ofprimaryvoltaiccells(cells thatcannotbe
recharged)or secondarycells (cells thatcan be recharged)connectedin seriesto obtaina desiredDC
voltage

• A batterystoreschemicalenergyand convertstheenergyinto electricalform

• Aircraft storagebatteriesaregenerallyratedat 12 or 24 volts

Capacitor- ANSWER • Electricaldeviceusedto storechargeand energyin the
form of an electrostaticfield

• A capacitoris a devicemadeof twoparallelconductorsseparatedby an insulator

Conductor- ANSWER • Common building block of electrical circuits that easily permits
the
movementof electronsfrom an electricalsourceto a loadand backto theelectricalsourcewitha
minimum of resistance.

• A conductor'sresistancedependson such factorsas crosssectionalarea,length,temperature,and
conductormaterial.



Coulomb- ANSWER • Basic unit of electricalquantity.

• A coulombis equalto 6.28billion - billion electrons(6.28x 10 to the18th)



Current - ANSWER • The flowof electronsthrougha conductoris knownas currentflow.

• The rateof currentflowis measuredin amperes.

Direct Current (DC) - ANSWER • A flowof electronsin onedirectionthroughout

,an electriccircuit withconstantvoltageand current.

• Direct currentis causedby a constantdifferenceof potential,bothnegativeand positive.

Electron- ANSWER • Negativelychargedsubatomicparticlesthatarelocatedand travelaround
(orbit) thenucleusin an imaginarysphereor shellat thespeedof light (186,000miles/second)

• Electronsareinvolvedin theconductionof electricity.

EMF (electromotiveforce)- ANSWER • The forcethatcauseselectronsto flow
througha conductor.

• This forceis abbreviatede.m.f.

• The unit of measurementfor eletromotiveforceis thevolt.

• In mathematicalproblemsvoltageis expressedby theletter"E".Farad -

ANSWER • Basic unit of capacitance

• One faradholdsonecoulombundera pressureof onevolt.



Henry (H) - ANSWER • Basic unit of measurementfor inductanceof an electrical
coil

• One (1) henryis theinductanceof a coil whena changeof currentof one(1) ampereper
secondinducesan e.m.f.of one(1) volt

• In mathematicalproblemsinductanceis expressedby thesymbol"L".

Inductor - ANSWER • Coil or otherdeviceusedto introduceinductanceinto a circuit.

• An inductoris a winding,or coiling, of multipleturns of wire

Insulator- ANSWER • Materialor deviceusedto preventthepassageof heat,
electricity,or soundfrom onemediumto another.Left hand

rule - ANSWER • Refersto electrical

• This rule is for determiningthedirectionof movementof a current- carrying conductorin a
magneticfield

,MagneticPermeability- ANSWER • Measureof easethatlines of flux travel
througha material

Magnetism- ANSWER • Ability of a magnetto attractcertainmaterialscontaining
iron and to influenceelectrons

• Magnetismis theprinciplewayto effectivelyproduceAC electricity

MetricPrefixes- ANSWER • Measurementsrelatingor using themetricsystemof
measurement

Neutron- ANSWER • Neutralsubatomicparticlesthatexistwithinthenucleusof
all atoms

• Neutronsarenot involvedin theconductionof electricity

Ohm - ANSWER • Unit of electricaloppositionto theflowof current

• A circuit has oneohm of resistancewhenit limits theflowof currentto oneamp undera voltage
pressureof onevolt

Ohm'sLaw - ANSWER • Ohm's Law states "the amount of current flowing in a circuit
is
directlyproportionalto thecircuit voltageand inverselyproportionalto thecircuit resistance"

• A plain languagestatementfor Ohm'sLaw is; Onevolt causesoneampereto flow
througha resistanceof oneohm.



Proton- ANSWER • Positivelychargedsubatomicparticlesthatexistwithinthe
nucleusof all atoms

• Protonsarenot involvedin theconductionof electricity



Resistance(R) - ANSWER • Electricalcharacteristicof a conductor

• Oppositionthata circuit, component,or substancepresentsto flowof electricity

• Resistanceis theforcethatopposesor slowsdownanotherforce,drops voltage,and consumes
power

• Resistanceis measuredin ohms

, • In mathematicalproblemsohmsof resistanceis expressedby symbol"R"

Scientific Notation - ANSWER • Short way of expressing a given number between1 and 10
multipliedby 10 to theappropriatepower

StaticElectricity- ANSWER • Electricalchargethatmay be built up on a
non-conductivesurfaceby friction

• Staticelectricityservesno usefulpurpose

Volt (V) - ANSWER • Basic unit of electricalpressure

• A volt is theamountof forcerequiredto causeoneampof currentto flow
throughoneohm or resistance

• Volt is oftenexpressedby such termsas voltage,voltagedrop,potential
difference,EMF, or IR drop

Watts(W) - ANSWER • Basic unit of powerthatis theproductof voltage
multipliedby current

• One wattis powerpo

producedin a circuit thathasoneampof currentflowingundera pressureof onevolt

Working Voltage- ANSWER • Maximumamountof DC voltagethat can be safelyappliedacrossa
capacitor

AlternatingCurrent (AC) - ANSWER • Flow of electronsthatcontinuously
changesit valuein magnitudeand periodicallyreversesdirection(sine-wave)

• Alternatingcurrentis much easierto producein largequantitiesas comparedto DC. The time
requiredfor onecycleof AC to occur is calledtheperiod

ApparentlyPower- ANSWER • Productof effectivevoltageand effectivecurrent whichis expressed
in Volt Amps (VA) rather than Watts (W) withoutreferenceto phaseshift, if any, betweenvoltage
and current

CapacitiveReactance(XC) - ANSWER • Oppositionto currentflowin a circuit

• The affectthatcapacitancehas on an AC circuit to leadvoltagein phase(ICE)

• Valuesaregivenin ohms

DeltaWound- ANSWER • Windings arrangedin theshapeof a triangle