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Find the time required for a 50Hz altern...

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

A

`2.5 ms`

B

`5.0 ms `

C

`10.0 ms `

D

`15.0 ms `

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Knowledge Check

  • 20Omega resistance is connected to V = 220sin (100 pi t) voltage source. Time taken by current to reduce from maximum value to its rms value is .....

    A
    0.2 s
    B
    0.25 s
    C
    `25xx10^(-3)` s
    D
    `2.5xx10^(-3)` s

  • The frequency of an alternating voltage is 50 cycles/s and its amplitude is 120 V. Then what is the rms value of voltage ?

    A
    101.3 V
    B
    84.9 V
    C
    70.7 V
    D
    56.5 V

  • In a circuit, the value of the alternating current is measured by hot wire ammeter as 10 ampere. What will be its peak value ?

    A
    `10 A`
    B
    `20 A`
    C
    `14.14 A`
    D
    `7.07 A`

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