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  4. A zener diode of power rating 2 W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it has to regulate voltage fluctuated between 6 V and 14 V, the value of R s for safe operation should be Ω.

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Q. A zener diode of power rating $2 W$ is to be used as a voltage regulator. If the zener diode has a breakdown of $10 \,V$ and it has to regulate voltage fluctuated between $6\, V$ and $14\, V$, the value of $R _{ s }$ for safe operation should be _____$\Omega$.Physics Question Image

JEE MainJEE Main 2021Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

When unregulated voltage is $14\, V$ voltage across zener diode must be $10 \,V$ So potential difference across resistor $\Delta V _{ Rs }=4 V$ and $P_{z e n e r}=2 W$
$VI =2$
$I =\frac{2}{10}=0.2\, A$
$\Delta V_{Rs} = IR_{s}$
$ 4 \times 0.2 \,R_s \Rightarrow R_s = \frac{40}{2} = 20\,\Omega$