1.

Find the time required for a 50 Hz alternating current to become its value from zero to the rms value.

Answer»

2.5 MS
5.0 ms
10.0 ms
15.0 ms

Solution :`I=I_m sin omegat`
`therefore (2PI)/TXX t= pi/4`
`therefore I_(RMS)/I_m=sin omegat`
`therefore t=T/8`
`therefore 1/sqrt2 = sin omegat`
but `T=1/f = 1/50`=0.025
`therefore omegat=pi/4`
`therefore t=0.02/8`= 0.0025
=2.5 ms


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