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Time for the current in a 50 Hz resistive circuit to fall from its peak to its rms value

The same question, asked 3 times: 2021 Paper 9, 2021 Paper 15*, 14 Jun 2022. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 9

    17
    An AC source rated 220 V,50 Hz220\text{ }V,50\text{ }Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is:

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  2. Question 2

    2021 Paper 15

    18
    In an AC circuit having resistance of 10Ω10\Omega, find the time taken by current to reach RMS value from maximum value. Frequency and RMS voltage of the source is 50 Hz50\text{ }Hz and 220 V220\text{ }V respectively.

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  3. Question 3

    14 Jun 2022

    11
    A resistance of 40Ω40\Omega is connected to a source of alternating current rated 220 V,50 Hz220\text{ }V,50\text{ }Hz. Find the time taken by the current to change from its maximum value to rms value:

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