What Is Frequency
What is Frequency – The number of cycles/second is called the frequency of the alternating quantity. Its unit is hertz (Hz).
In the simple 2-pole alternator one cycle of alternating current is generated in one revolution of the rotating field. However, if there were 4 poles, then two cycles would have been produced in each revolution. In fact, the frequency of the alternating voltage produced is a function of the speed and the number of poles of the generator. The relation connecting the above three quantities is given as
f = PN/120
where N = revolutions in r.p.m.
and P = number of poles
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It may be noted that the frequency is given by the reciprocal of the time period of the alternating quantity.
∴ f = 1/T or T = 1/f
Read article – alternating current
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