Question

in ac supply number of cycles per second is called

Answer 1

frequency used to be expressed" cycle in per second" it is more commonly specified in unit called Hertz.

Answer 2

AC frequency is the number of cycles per second in an alternating current (ac) sine wave. Said another way, frequency is the rate at which current changes direction per second. It is measured in hertz (Hz), an international unit of measure where 1 hertz is equal to 1 cycle per second.