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Solution


Q.

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 Rs for safe operation of diode will be                  [2023]
1 13.3 Ω  
2 12 Ω  
3 10 Ω  
4 13 Ω  

Ans.

(3)

Vb=8 volt

VA-VB=8 volt

Current through zener diode,

i=PV=1.6 W8 V=0.2 A

VC-VA=10-8 volt

R=VC-VAi=2 V0.2 A=10 Ω

[Note: A zener diode can regulate only if input voltage ≥ zener breakdown voltage. The range of input voltage should be 8 to 10V so that output voltage remains constant = 8V]