JEE Main · 2026 · 24 Jan 2026 · Shift 1 · Semiconductors

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A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W, is operated at 15 V. The approximate value of protective resistance in this circuit is ______

Ω

Answer: 125

Solution

At the rated limit the Zener dissipates

P_{D} = V_{Z} I_{Z}

, so

I_{Z} = \frac{0.4}{10} = 0.04

A. The series protective resistor carries this current and drops the surplus voltage

15 - 10 = 5

V, so

R = \frac{15 - 10}{0.04} = 125

. The protective resistance is about

125 Ω

JEE Main · 2026 · 24 Jan 2026 · Shift 1 · Integer answer

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