P-N junction diode

Question

In the given figure, a diode D is connected to an external resistance R = 100 $\Omega $ and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be

Moderate

Solution

The potential difference across the resistance R is

$V=3.5\mathrm{V}-0.5\mathrm{V}=3\mathrm{V}$

By Ohm's law

The current in the circuit is

$I=\frac{V}{R}=\frac{3\mathrm{V}}{100\Omega}$

$=3\times {10}^{-2}\mathrm{A}=30\times {10}^{-3}\mathrm{A}=30\mathrm{mA}$

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