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A Zener of power rating 1 W is to be use...

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 3 V and 7 V, what should be the value of `R_(s)` for safe operation (see figure) ?

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The correct Answer is:
A
Supply voltage may be 7V and zener breakdown at 5V. So, voltage drop across resistance ` R = 7 -5 = 2V`
Now power rating of zener = 1 W.
So, current through zener must not exceed
` I = P / V = 1 / 5 A `
Hence , series resistance
` R = V / i = 2 / (1 / 5) = 10 Omega`
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