Question

In united states of America ,the current changes its sign after every 1÷120 seconds.What is the frequency of AC supply in USA.


Mark : 1.0​

Answer 1

$\huge\tt{Answer:-}$

Here, time, after which current changes its sign is given as :

$\sf t = \dfrac{T}{2} = \dfrac{1}{120} s$

$\sf \implies T = \dfrac{2}{120} s$

$\sf \implies T = \dfrac{1}{60} s$

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$\sf \therefore Frequency \: of \: AC, v = \dfrac{I}{T}$

$\sf \implies v = \dfrac{1}{\dfrac{1}{60}}$

$\sf \implies v = 60 Hz$

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Therefore, frequency of AC in USA is 60Hz.