Midterm Exam Flashcards
the fundamental alternating current (ac) and alternating voltage waveform.
sinusoidal waveform (sine wave)
It is a disturbance.
Wave
are characterized by the amplitude and period
Sine waves
the maximum value of a voltage or current
Amplitude
the time interval for one complete cycle
Period
the number of cycles that a sine wave completes in one second
Frequency ( f )
Measured in Hertz
Frequency ( f )
are produced by ac generators and electronic oscillators.
Sinusoidal voltages
The rms value is ________ times the peak value.
0.707
the average value is as times the peak value.
0.637
an angular measurement that specifies the position of a sine wave relative to a reference
phase of a sine wave
the projection of a vector rotating at a constant rate
phasor
allow ac calculations to use basic trigonometry
Phasors
The velocity of rotation
Angular velocity
repetition rate of the waveform
fundamental frequency
frequencies that are odd multiples of the fundamental frequency
Odd harmonics
frequencies that are even multiples of the fundamental frequency
Even harmonics
composed only of the fundamental frequency and odd harmonics
Square wave
Current that reverses direction in response to a change in source voltage polarity
Alternating current
The voltage or current value of a waveform at a given instant in time.
Instantaneous value
The voltage or current value of a waveform at its maximum positive or negative points.
Peak value
The voltage or current value of a waveform measured from its minimum to its maximum points.
The va
Peak-to-peak value
The value of a sinusoidal voltage that indicates its heating effect, also known as effective value.
Rms value
Rms stands for?
Root mean square
A unit of angular measurement
Radian
A type of waveform that consists of two equal and opposite steps in voltage or current separated by a time interval.
Pulse
The frequencies contained in a composite waveform, which are integer multiples of the pulse repetition frequency
Harmonics
A type of waveform that follows a cyclic sinusoidal pattern defined by the formula y = A sin theta
Sine wave
