Question

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The frequency of an alternating current is 60 hz it means ac changes its direction after
1)1/120 sec
2) 1/100 sec
3) 1/50 sec
4)1/60 sec

Answer 1

Option (4) is correct.

Answer: The frequency of an alternating current is 60 Hz it means ac changes its direction after 1/60 sec.

Explanation:

If T be the time period of completion of a cycle, ω be the frequency, by definition of 'time period', we get,

T = 2π / ω

By definition of 'frequency', we write

T = 1/f, where f is frequency

or, T = 1/60 sec [ given f = 60 Hz ]

Answer: Therefore the frequency of an alternating current is 60 Hz; it means ac changes its direction after 1/60 sec.

Answer 2

Answer:

(d) 1/60 seconds

Explanation:

60 hz means that the current changes its direction 60 times in a second.

Hence By unitary Method

60 time change in direction  --  1 second

change in direction once      --  1/60 sec

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