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Basic Electrical Theory: Unit 6 - Uses of Electromagnetism
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Basic Electrical Theory: Unit 6 - Uses of Electromagnetism
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BASIC ELECTRICAL THEORY: UNIT 6 -USES OF ELECTROMAGNETISM
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Ohmmeters dmeasure dthe d__________ dor dopposition dto dcurrent dflow dof da dcircuit dor dcomponent. d-
dresistance
The dstationary dmagnetic dfield dof da ddc dmotor, dcalled da d"___________," dis da dpermanent dmagnet dor
dan delectromagnet. d- dstator
"Normally dOpen" dmeans dthat dthe dcontacts dare dopen dwhen dpower dis dapplied dto dthe dcoil. d- dFalse
A dholding drelay dis dprimarily dused dfor dworker dconvenience. d- dFalse
DC dammeters dof dthe ddirect dconnection dtype dmust dbe dconnected din d_____ dwith dthe dpower dsource
dand dthe dload. dIf dconnected din dreverse dpolarity, dthe dcoil dwill dmove din dthe dopposite ddirection. d-
dseries
A dclamp-on dac dammeter dhas da dcoil dthat dis dclamped daround dthe dconductor dand ddetects dthe drising
dand dfalling d_____ dfield dbeing dproduced ddue dto dthe dac dflow dthrough dthe dconductor. d- dmagnetic
Voltmeters dare dconnected din d_____ dwith dthe dcircuit dand dmeasure dthe ddifference dof dpotential
dbetween dthe dtwo dtest dleads. d- dparellel
The dconductor dthat drotates dbetween dthe dstationary dmagnetic dfield dpoles dof dthe dstator dis dcalled dthe
d"_____." d- dwindings dor darmature
An delectromagnetic drelay dis da dswitch dthat duses dan delectromagnetic dfield dto dopen dor dclose dits
dcontacts. dOne dpart dof dthe dcontact dis dfixed dand dthe dother dmoves dby dthe dattraction dof dthe
delectromagnetic dfield. d- dTrue
The d_____ dof da dgenerator dis dforced dto drotate dwhile dit dis dbeing dsubjected dto dthe dmagnetic dfield dof
dthe dstator. d- drotor
"Normally dClosed" dmeans dthe dcontacts dare dclosed dwhen dthe dcoil dis denergized. d- dFalse
The dMegger dis dused dto dmeasure dvery dhigh-_____ dvalues, dsuch das dthose dfound din dcable dinsulation,
dor dmotor dand dtransformer dwindings. d- dresistance
The delectric dmotor dworks don dthe dprinciple dof dthe dattracting dand drepelling dforces dof d_____ dfields. d-
dmagnetic
The dWheatstone dBridge dmeter dis dused dfor dextremely daccurate d_____ dmeasurements. d- dresistance
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