Fundamentals Of Ac Flashcards
What are three factors that determine the amount of emf generated?
The flux density of the field
The length of the conductor on the field
The rate at which the conductor cuts lines of force (speed and angle
How many alternations are in one electrical cycle?
Two
What angle produces a peak positive value of voltage
90 degrees
What angle creates a peak negative voltage?
270
What angle is no voltage produced
0, 180 and 360
What is the formula and symbol for frequency?
F=pxr/120. Symbol is (F)
Define frequency?
The number of electrical cycles per second it is measured in hertz (HZ) it was formerly measure in cycles per second
What determines the frequency output of an ac generator?
The number of poles or pole pairs
The number of Rpm revolution per minute
What is a time period in relationship to frequency
The time to complete an electrical cycle
What is a peak max value and how is it calculated
The lines of force cuts at 90 the most voltage or current it can be produce peak positive is at 90 and peak negative is at 270 degrees
Formula is Emax times sine 45 or emax divide sine 45 or 0.707
How is peak value identified
Emax or Epeak or Em
What is an instantaneous value and how is it calculated
The value given time or angle
e=Emax times sine angle
What is a effective value
The effective value RMS Root mean Squared value. It is produced by the same heat that is used in DC cct
