A1 LT19 Flashcards
What are the brushes made of?
Graphite carbon
How many rpm does the prime mover of a four-pole alternator need to produce a 60 hertz waveform?
1800 rpm
What is the challenge with passing a conductor through a magnetic field?
Keeping the conductor moving continuously
What is the purpose of the brushes?
Carry current to load circuit
What supplies the mechanical energy to the alternator?
Prime mover
What is the part of the alternator where voltage is induced?
Armature
Name some common examples of prime movers.
Steam turbines, water turbines, internal combustion engines, windmills
Can a hand crank serve as a prime mover for an alternator?
Yes
How do the conductors connect in an alternator?
In series
What happens when each loop is added to the alternator’s armature?
Increases generated voltage
How many poles do the armature windings of a six-pole alternator pass every revolution?
3 north, 3 south
What rpm does the prime mover need to turn at to produce a 60 hertz output in a six-pole alternator path?
1200 rpm.
How can the magnitude of the induced voltage be controlled?
By altering variables I or v
What are slip rings made of and how are they positioned on the alternator shaft?
Brass, two complete loops
Why does an alternating current generator produce an alternating voltage?
Angle and direction of cutting flux lines change continuously.