Question

why AC current have frequency

Answer 1

AC frequency is the number of cycles per second in an alternating current ( ac ) sine wave....
Ex : if an ac is said to have a frequency of 5 Hz , that indicates it's wave form respected five times in 1 second !!!!

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Answer 2

AC frequency is the number of cycles per second in an alternating current (ac) sine wave. ... Example: If an alternating current is said to have a frequency of 5 Hz (see diagram below), that indicates its waveform repeats 5 times in 1 second.