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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 the zener has a breakdown of 5V and it has to regulate voltage which fluctuates between 3V and 7V, what should be the value of Rs for safe operation (Fig.14.12)?

 

Answers (1)

Explanation:-

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

As we know that, P=VI

So, the current will be 

 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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