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The value of the resistor, R S , needed in the DC voltage regulator circuit shown here, equals:

Options

  1. AV i + V L n + 1 I L
  2. BV i - V L n I L
  3. CV i + V L n I L
  4. DV i - V L n + 1 I L

Correct answer

D. V i - V L n + 1 I L

Step-by-step solution

Across zener diode V L = c o n s t a n t ∵ V i = V L + n + 1 I L   R S ⇒ V i - V L = n + 1 I L   R S ⇒ R S = V i - V L n + 1 I L

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