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The instantaneous value of an AC is ...

The instantaneous value of an AC is given by ` I = 5 sin ( omega t + ph ) ` amp. The rms value of current is

A

` 5A `

B

` ( 5 ) /( sqrt 2 ) A `

C

` 5 sqrt 2 A `

D

` 2.5 A `

Text Solution

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The correct Answer is:
B
We know that, ` I _ ( rms ) = ( I _ 0 ) /( sqrt 2 ) `
In the given equation, peak value of current
` ( I _ 0 ) = 5 `
` therefore I _ ( rms ) = ( 5 ) /( sqrt 2 ) A `
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