Question

1 Find the time required for a 50 HZ alternating current to change from o to its rms values
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Answer 1

Explanation:

Alternating current   i=iosinwt

where  w=2πf=2π×50=100 π

For  i=irms=2io

We get   2io=iosinwt

Or   sinwt=21

Or   wt=4π

Or    100π×t=4π

We get   t=4001 seconds

Alternating current   i=iosinwt

where  w=2πf=2π×50=100 π

For  i=irms=2io

We get   2io=iosinwt

Or   sinwt=21

Or   wt=4π

Or    100π×t=4π

We get   t=4001 seconds

Answer 2

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