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A zener diode of power rating 1 . 6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate voltage fluctuating between 3 V and 10 V The value of resistance R s for safe operation of diode will be

Options

  1. A10   Ω
  2. B12   Ω
  3. C13 . 3   Ω
  4. D13   Ω

Correct answer

A. 10   Ω

Step-by-step solution

Power rating of zener diode = 1 . 6   W From the diagram above, V A - V B = 8   V Power is given by P = V i ⇒ i = 1 . 6   W 8   V = 0 . 2   A Also, V C - V A = 10   V - 8   V = 2   V Thus, using Ohm's law, R s = 2   V 0 . 2   A = 10   Ω

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