C10 ELECTRICAL CALCULATIONS EXAM QUESTIONS WITH DETAILED VERIFIED ANSWERS (100- CORRECT ANSWERS) A+ GRADE ASSURED

C10 ELECTRICAL CALCULATIONS EXAM
QUESTIONS WITH DETAILED VERIFIED ANSWERS
(100% CORRECT ANSWERS) A+ GRADE ASSURED

IfPaPlightPbulbPinPaPcircuitPhasPaPresistancePofP100PohmsPandP1PamperePofPcurrentPflowsPinPthePcircuitPwhenPt
hePswitchPisPclosed,PwhatPisPthePvoltagePoutputPofPthePbattery?P
a.P10Pvolts.P
b.P100Pvolts.P
c.P110Pvolts.P
d.P120Pvolts.P
e.P200Pvolts.P-PcorrectPanswer-b


APDCPcircuitPhasP12PvoltsPandPaPresistancePofP300Pohms.PThePcurrentPflowingPis:P
a.P0.4Pamps.P
b.P40Pmilliamps.P
c.P400Pmilliamps.P
d.P3600Pamps.P
e.P25Pmilliamps.P-PcorrectPanswer-b


CircuitPvoltagePisP24.PCurrentPisP10Pamps.PThePresistancePis:P
a.P240Pohms.P
b.P0.240Pmicro-ohms.P
c.P2.4Pohms.P
d.P0.416Pohms.P
e.P24Pohms.P-PcorrectPanswer-c


AccordingPtoPOhm'sPLaw:P
a.PIfPyouPraisePE,PIPwillPgoPupP
b.PIfPyouPraisePE,PIPwillPgoPdownP
c.PIfPyouPraisePR,PIPwillPgoPupP

,d.PIfPyouPraisePI,PRPwillPgoPupP
e.PIfPyouPlowerPR,PIPwillPgoPdownP-PcorrectPanswer-a


APsingle-
phasePcircuitPhasPmeterPreadingsPofP20PA,PandP220PV.PThePpowerPfactorPisP78.8%.PCalculatePthePimaginaryP
powerPofPthePcircuit.P
a.P2454PW.P
b.P2500PW.
c.P2652PW.P
d.P2709PW.P
e.P2825PW.P-PcorrectPanswer-d


IfPthePresistancePinPaPcircuitPwasPkeptPconstantPandPthePappliedPvoltagePwasPincreased,PtherePwouldPbe:P
a.PAPcorrespondingPdecreasePinPcurrent.P
b.PNoPchangePinPcurrent.P
c.PAPcorrespondingPincreasePinPcurrent.P
d.PNoPchangePinPresistance.P
e.PAPcorrespondingPdecreasePinPresistance.P-PcorrectPanswer-c


Ohm'sPLawPcanPbePusedPto:P
a.PCalculatePcurrentPflowPifPthePappliedPemfPandPresistancePisPknown.P
b.PCalculatePthePrequiredPemfPtoPcausePaPrequiredPcurrentPtoPflowPthroughPaPknownPresistance.P
c.PCalculatePthePrequiredPcircuitPresistancePifPthePvoltagePandPcurrentPflowParePknown.P
d.PAllPofPthePabove.P
e.PNonePofPthePabove.P-PcorrectPanswer-d


IfPthePresistancePofPaPcircuitPisPdecreasedPtoP1/4PofPitsPoriginalPvalue,PwhatPhappensPtoPthePcurrentPifPthePsup
plyPvoltagePisPunchanged?P
a.PCurrentPisP1/4PofPoriginal.P
b.PCurrentPisPthePsame.P
c.PCurrentPisP1/2PofPoriginal.P

, d.PCurrentPisP4PtimesPoriginal.P
e.PCurrentPisP2PtimesPoriginal.P-PcorrectPanswer-d


IfPthePresistancePofPaPcircuitPisPdecreasedPtoP1/4PofPitsPoriginalPvalue,PwhatPcircuitPchangePcanPbePmadePtoPm
aintainPthePoriginalPcircuitPcurrent?P
a.PThePvoltagePwouldPbeP1/4PofPoriginal.P
b.PThePvoltagePwouldPbeP4PtimesPoriginal.P
c.PThePvoltagePwouldPbeP1/2PofPoriginal.P
d.PThePvoltagePwouldPremainPconstant.P
e.PThePvoltagePwouldPbePdoubled.P-PcorrectPanswer-a


APWheatstonePBridgePhasPanPappliedPvoltagePEP=P24PV,PR1P=P400PΩ,PR2P=P500PΩ,PandPR4P=P200PΩ.PCalcul
atePthePvaluePofPR3PrequiredPtoPbalancePthePbridge.P
a.P100PΩP
b.P160PΩP
c.P200PΩP
dP.250PΩP
e.P280PΩ.P-PcorrectPanswer-b


WhatPvaluePwouldPR3PhavePtoPbe,PtoPbalancePthePbridgePshown?P
P


a.P300PΩP
b.P400PΩP
c.P450PΩP
d.P480PΩP
e.P540PΩ.P-PcorrectPanswer-d


ThePfollowingPmeterPreadingsPwerePtakenPinPanPinductivePsingle-
phasePcircuit:PwattmeterP2400PW;PvoltmeterP240PV;PammeterP15PA,PfrequencyPmeter,P60PHz.PNotePthatPaPwa
ttmeterPindicatesPthePactivePpowerPandPvoltmetersPandPammetersPindicatePeffectiveP(rms)Pvalues.PFindPthePa
pparentPpowerP(VA)P
a.P3600PVA.P