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  • 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 (Fig.14.12)?

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 (Fig.14.12)?

 

Answers (1)

 According to the problem Power=1 Watt
Zener breakdown voltage Vz=5V
Minimum voltage Vmin=3V
Maximum voltage Vmax=7V

We know, P=VI

So current I_{z_{max}}=\frac{P}{V_{z}}=\frac{1}{5}=0.2A

for safe operation, Rs will be equal to

R_{s}=\frac{V_{max}-V_{z}}{I_{z_{max}}}=\frac{7-5}{0.2}=\frac{2}{0.2}=10\Omega

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infoexpert24

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