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Home » A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of 5V and it has to regulate voltage which fluctuated between 3V and 7V, what should be the value of Rs for safe operation in the figure?
A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of 5V and it has to regulate voltage which fluctuated between 3V and 7V, what should be the value of Rs for safe operation in the figure?
CBSE | Class 12 | NCERT Exemplar | Physics | Semiconductor Electronics: Materials, Devices and Simple Circuits
A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of 5V and it has to regulate voltage which fluctuated between 3V and 7V, what should be the value of Rs for safe operation in the figure?

Exemplar Solutions Class 12 Physics Chapter 14 - 13

Answer:

According to the question, Power = 1W and Zener breakdown voltage = 5V

We are given that the minimum voltage = 3V and the maximum voltage = 7V

{{I}_{\max }}=\frac{P}{{{V}_{z}}}=\frac{1}{5}

{{I}_{\max }}=0.2A

{{R}_{s}}=\frac{{{V}_{\max }}-{{V}_{\min }}}{{{I}_{\max }}}=\frac{7-3}{0.2}

{{R}_{s}}=20\Omega

i

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