The circuit diagram used to study the characteristic curve of a zener… | JEE Main 2022 (30 Jun, Shift 1)

Q55JEE Main 2022 · 30 JUN · SHIFT 1Medium

Special Purpose Diodes

The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0 $-$ 15 V) as shown in figure. A zener diode with maximum potential Vz = 10 V and maximum power dissipation of 0.4 W is connected across a potential divider arrangement. The value of resistance RP connected in series with the zener diode to protect it from the damage is ________________ $\Omega$ .

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

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Answer: 125

Maximum Zener current: $I = \frac{P}{V_Z} = \frac{0.4}{10} = 0.04$ A
At the full supply $15$ V, drop across $R_P$ is $15 - 10 = 5$ V.
$R_P = \frac{5}{0.04} = 125\ \Omega$

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