Attributes of AC Signals
The most common ac signal is the sine wave. In fact, all periodic
waveshapes are composed of sine waves of varying frequency,
amplitude, and phase added together. The individual sine waves are
harmonically related to each other — that is to say, the sine wave
frequencies are integer multiples of the lowest (or fundamental)
frequency of the waveform. Unlike dc signals, the amplitude of
ac waveforms varies with time as shown in the following figure.
V rms
V avg
V pk
V pk-pk
T ( f =
1
T
)
A sine wave can be uniquely described by any of the parameters
indicated — the peak-to-peak value, peak value, or RMS value,
and its period (T) or frequency (1/T).
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Chapter 7 Tutorial
Attributes of AC Signals
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