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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)?


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 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


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