Fundamentals of Alternating Current 030201a Flashcards
What factors effect the amount of EMF generated?
Density of the magnetic flux (More lines more EMF)
Length of the conductor within the magnetic field.
Rate at which the conductor cuts the lines of magnetic force.
A conductor has to cuts lines of force at what angle to produce maximum EMF?
90° and 270°.
What has occurred if one electrical cycle has been completed?
A conductor has passed one pair of poles. 360 electrical degrees.
How many alternations are in 1 electrical cycle?
2 alternations. 1 positive and 1 negative.
What is the symbol for frequency?
f
What is frequency measured in and what is the symbol for it?
Hertz. (Hz)
What is the difference between an electrical cycle and a mechanical cycle?
360 electrical degrees has been completed after each pair of poles has been passed.
360 mechanical degrees has been completed when a machine has made one full rotation.
What is the equation for frequency?
f = p X n / 120
f = frequency
p = number of poles
n = rotational frequency
What is known as the period?
Time required to complete one electrical cycle.
What is the equation to calculate an instantaneous value on a sine wave?
e = Emax X Sin θ
i = Imax X Sin θ
What degrees is the effective value found at on a sine wave?
45°
What is also known as the effective value?
RMS value (Root Mean Square)
What is the equation for effective values?
E = Emax X Sin 45
I = Imax X Sin 45
If a meter is used on a circuit, what value does it read for a sine wave?
Effective or RMS value.
