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A Zener diode of power rating 1 W is to be used as a voltage regulator. If Zener diode has a breakdown voltage of 5 V and it has to regulate voltage which fluctuates between 3 V and 7 V, what should be value of R_S for safe operation

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$10 Ω$

$20 Ω$

$30 Ω$

$40 Ω$

answer is A.

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Detailed Solution

P = 1 W

$V_{z} = 5 V$

$I_{z_{max}} = \frac{P}{V_{Z}} = \frac{1}{5} A$

For safe operation

$R_{8} = \frac{V_{max} - V_{Z}}{I_{z_{max}}} = \frac{7 - 5}{(1 / 5)} = 10 Ω$

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