First slide

Diodes

Question

A Zener diode, having breakdown voltage equal to 10 V, is used in voltage regulator circuit shown in figure. The current through the diode is

Moderate

A

20A
B

15mA
C

10mA
D

25mA

Solution

Voltage across zener diode and load resistance remains same.
$C u r r e n t t h r o u g h l o a d r e s i s \tan c e : I_{L} = \frac{V_{0}}{R_{L}} = \frac{10}{2 \times 10^{3}} = 5 m A$
$V o l t a g e a c r o s s s e r i e s r e s i s \tan c e : V_{S} = V - V_{Z} = 25 - 10 = 15 V$
$C u r r e n t t h r o u g h s e r i e s r e s i s \tan c e : I_{s} = \frac{V_{s}}{R_{S}} = \frac{15}{500} = 0.03 A = 30 m A$
$S o, C u r r e n t t h r o u g h d i o d e : I_{Z} = I_{S} - I_{L} = 30 - 5 = 25 m A$

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