fundamentals of ac Flashcards
A cycle is a set of events that ?
reoccurs in some set of sequence
One cycle of alternating current means that the current starts at zero, rises to a maximum value in one direction, diminishes to zero, rises to a maximum value in the opposite direction, and then returns to zero.
true
During one cycle, the current flows in how many directions?
2
If one plots all of the instantaneous values of an AC voltage on a graph, the result will be a ?
sine wave
The sine wave is positive from 180° to 360° and negative from 0° to 180°
false
Each cycle of an AC waveform represents ?
360 electrical degrees
The number of cycles that occur in one second of time is known as the ?
frequency
The maximum negative voltage of an AC waveform will be at ? on a sine wave.
270
Which of the following values compares the amount of energy available in an AC waveform to a DC waveform?
effective
If the effective voltage in a conductor is 500 kilovolts, what is the peak voltage in this conductor?
707,000 v
The maximum positive voltage will appear how many times per second in a 60-cycle AC?
60
In an AC system, a sine wave can be used to represent both current and ? values.
voltage
A waveform shows the magnitude and direction of a voltage or current at every instance of time.
true
The RMS value is equal to the peak value times ?
0.707
The time required for one cycle is called the ?
period
