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  4. When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is :

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Q. When a diode is forward biased, it has a voltage drop of $0.5 V$. The safe limit of current through the diode is $10 mA$. If a battery of emf $1.5 V$ is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is :

JEE MainJEE Main 2020Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

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$1.5-0.5- R \times 10 \times 10^{-3}=0$
$\therefore R =100 \Omega$