Question

plz help me in this question

Answer 1

The alternating current flow in forward and reverse direction, this motion of current is called as a cycle. When one cycle is completed in one second then it is said that Alternating current has frequency one.
Frequency of current = no. of cycle in one second
In India the frequency of AC current is 50 Hz (50 cycles per second)
It is beneficial to have a AC current transmission over a long distance because minimum power lose occur during the transmission