Questions
An ac voltage is represented by . How many times will the current become zero in 1 s?
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a
50 times
b
100 times
c
30 times
d
25 times
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Correct option is A
E=E0 cosωt∴ ω=50π2πf=50π⇒f=25 HzIn one cycle ac current becomes zero twice.Therefore, 50 times the current becomes zero in 1 s.
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The peak value of an alternating emf E given by is 10 V and frequency is 50 HZ. At time t = (1/600) s, the instantaneous value of emf is
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