JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Semiconductors

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A zener diode of power rating 2 W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it has to regulate voltage fluctuated between 6 V and 14 V , the value of

R_{s}

for safe operation should be ____

Ω

Answer: 20

Solution

Maximum current through zener:

I_{ma x} = \frac{P}{V _{z}} = \frac{2}{10} = 0.2

A. For safe operation at maximum input voltage (14 V), the series resistor must limit current:

R_{s} = \frac{V _{in, ma x} - V _{z}}{I _{ma x}} = \frac{14 - 10}{0.2} = \frac{4}{0.2} = 20Ω

JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Integer answer

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