The time taken in seconds by an alternating quantity to complete one cycle is known as periodic time and is denoted by T.

The number of cycles completed per second by and alternating quantity is known as frequency and is denoted by f. In SI system the frequent is expressed in hertz (pronounced as hurts).

The number of cycles completed per second  = f

Periodic time, T = Time taken in completing one cycle 1
                                                                            f

or   f  =  1
            T

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