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Q.

The breakdown voltage of a zener diode used for voltage regulation is 12V. The load current is 12 mA and the unregulated input is 20 V. If the maximum current through the zener diode is 25 mA, then value of series resistance R is

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a

86.48 Ω

b

216.2 Ω

c

21.62 Ω

d

864.86 Ω

answer is B.

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Detailed Solution

detailed_solution_thumbnail

I=IL+IZ = 12+25=37mA

Given vZ=12

R=20−v2I=837×10-3=216.2Ω

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