Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
46 Cards in this Set
- Front
- Back
|
the maximum value of a voltage or current
|
amplitude
|
|
|
one repetition of a periodic waveform
|
cycle
|
|
|
the unit of angular measure corresponding to 1/360 of a complete revolution
|
degree
|
|
|
a characteristic of a pulse waveform that indicates the percentage of time that a pulse is present during a cycle
|
duty cycle
|
|
|
the ratio of pulse width to period expressed as either a fraction or as a percentage
|
duty cycle
|
|
|
the time interval required for a pulse to change from 90% to 10% of its amplitude
|
fall time
|
|
|
(tf)
|
fall time
|
|
|
a measure of the rate of change of a periodic function
|
frequency
|
|
|
the number of cycles completed in 1 s
|
frequency
|
|
|
the unit of frequency is the hertz
|
frequency
|
|
|
(f)
|
frequency
|
|
|
an instrument that produces more than one type of waveform
|
function generator
|
|
|
the repetition rate of a waveform
|
fundamental frequency
|
|
|
the frequencies contained in a composite waveform, which are integer multiples of the pulse repetition frequency
|
harmonics
|
|
|
the unit of frequency
|
hertz
|
|
|
(Hz)
|
hertz
|
|
|
one hertz equals one cycle per _____
|
second
|
|
|
an ac motor that achieves excitation to the rotor by transformer action
|
induction motor
|
|
|
the voltage or current value of a waveform a t a given instant in time
|
instantaneous value
|
|
|
an electronic circuit that produces a time varying signal without an external input signal using positive feedback
|
oscillator
|
|
|
a measurement instrument that displays signal waveforms on a screen
|
oscilloscope
|
|
|
the voltage or current value of a waveform measured from its minimum to its maximum points
|
peak to peak value
|
|
|
the voltage or current value of a waveform at its maximum positive or negative points
|
peak value
|
|
|
(t)
|
period
|
|
|
the time interval of one complete cycle of a periodic waveform
|
period
|
|
|
characterized by a repetition at fixed time intervals
|
periodic
|
|
|
the relative angular displacement of a time varying waveform in terms of its occurrence with respect to a reference
|
phase
|
|
|
a type of waveform that consists of two equal and opposite steps in voltage or current separated by a time interval
|
pulse
|
|
|
(tw)
|
pulse width
|
|
|
the time interval between the opposite steps of an ideal pulse
|
pulse width
|
|
|
for a nonideal pulse, the time between the 50% points on the leading and trailing edges
|
pulse width
|
|
|
a unit of angular measurement
|
radian
|
|
|
there are 2 radians in one complete ______ revolution
|
360
|
|
|
one radian equals ______
|
57.3
|
|
|
a type of waveform characterized by a linear increase or decrease in voltage or current
|
ramp
|
|
|
the time interval required for a pulse to change from 10% to 90% of its amplitude
|
rise time
|
|
|
(tr)
|
rise time
|
|
|
the value of a sinusoidal voltage that indicates its heating effect
|
rms value
|
|
|
also known as the effective value
|
rms value
|
|
|
it is equal to 0.707 times the peak value
|
rms value
|
|
|
rms stands for
|
root mean square
|
|
|
a type of waveform that follows a cyclic sinusoidal pattern defined by the formula v= a sin 0
|
sine wave
|
|
|
the difference between the synchronous speed of the stator field and the rotor speed in an induction motor
|
slip
|
|
|
an aluminum frame within the rotor of an induction motor that forms the electrical conductors for a rotating current
|
squirrel cage
|
|
|
an ac motor in which the rotor moves at the same rate as the rotating magnetic field of the stator
|
synchronous motor
|
|
|
the pattern of variations of a voltage or current showing how the quantity changes with time
|
waveform
|
