Information about Frequency and Phase

Units of Period and frequency


Frequency is the rate of change with respect to time.
Change in a short span of time means high frequency.
Change over a long span of time means low frequency.
The power we use at home has a frequency of 50-60 Hz.

If a signal does not change at all, its frequency is zero.
If a signal changes instantaneously, its frequency is infinite.


Phase describes the position of the waveform relative to time 0.

Fig.a shows a phase shift of 0 degrees.
Fig.b shows a phase shift of 90 degrees.
Fig.c shows a phase shift of 180 degrees.

Only at Engineer's Knowledge

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