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14. Semicondutor electronics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics14. Semicondutor electronics1 Mark
MCQ
The circuit shown below is working as a $8\; \mathrm{V}\;dc$ regulated voltage source. When $12 \;\mathrm{V}$ is used as input, the power dissipated (in $\mathrm{mW}$ ) in each diode is

(considering both zener diodes are identical)

  • A
    $20$
  • B
    $8$
  • C
    $24$
  • ✓
    $40$
✓

Answer

Correct option: D.
$40$
d
Current in circuit $=\frac{4}{400}=\frac{1}{100} \mathrm{A}$

So power dissipited in each diode $=$ $\mathrm{VI}$

$=4 \times \frac{1}{100} \;\mathrm{W}$

$=40 \times 10^{-3}\; \mathrm{mW}$

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