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Series resistance for a Zener regulator with a given power rating and breakdown voltage when the input fluctuates between two values

The same question, asked 2 times: 2021 Paper 21*, 10 Apr 2023. Every wording below, oldest first.

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  1. Question 1

    2021 Paper 21

    24
    A zener diode of power rating 2 W2\text{ }W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V10\text{ }V and it has to regulate voltage fluctuated between 6 V6\text{ }V and 14 V14\text{ }V, the value of RsR_{s} for safe operation should be ____\_\_\_\_ Ω\Omega.

  2. Question 2

    10 Apr 2023

    3
    A zener diode of power rating 1.6 W1.6\text{ }W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V8\text{ }V and it has to regulate voltage fluctuating between 3 V3\text{ }V and 10 V10\text{ }V. The value of resistance RsR_{s} for safe operation of diode will be:

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