A 8 V Zener diode along with a series resistance R is connected across a 20 V supply (as shown in the figure). If the maximum Zener current is 25 mA, then the minimum value of R will be _______ Ω. Numerical answer type. Work it out, then open the answer.

Answer: 480. R is smallest when the whole current through it is the maximum Zener current 25 mA (load drawing nothing). Drop across R: 20 - 8 = 12 V Rmin = 1225 × 10⁻³ = 480 Ω

A 8 V Zener diode along with a series resistance R is connected… | JEE Main 2022 (29 Jul, Shift 2)

Q53JEE Main 2022 · 29 JUL · SHIFT 2Medium

Special Purpose Diodes

A $8\text{ V}$ Zener diode along with a series resistance $\text{R}$ is connected across a $20\text{ V}$ supply (as shown in the figure). If the maximum Zener current is $25\text{ mA}$ , then the minimum value of R will be _______ $\Omega$ .

Numerical answer type. Work it out, then open the answer.

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Answer: 480

$R$ is smallest when the whole current through it is the maximum Zener current $25$ mA (load drawing nothing).
Drop across $R$ : $20 - 8 = 12$ V
$R_{min} = \frac{12}{25 \times 10^{-3}} = 480\ \Omega$

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