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A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400 resistor connected in series, the zener current is found to be 4 times load current. The load current (I_L ) and load resistance (R_ L ) are :

Options

  1. AI _ L =20 ~mA ; R _ L =250
  2. BI _ L =10 ~A ; R _ L =0.5
  3. CI _ L =0.02 ~mA ; R _ L =250
  4. DI _ L =10 ~mA ; R _ L =500

Correct answer

D. I _ L =10 ~mA ; R _ L =500

Step-by-step solution

From the circuit diagram, aligned & 5 i = 20 400 = 1 20 ~A & i = 1 100 ~A =10 ~mA = Load current aligned Also, V _ L =5 ~V R _ L = 5 10 10⁻³ =500

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