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Equivalent Resistance of a System of Resistor

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Question

Figure shows a diode connected to an external resistance and a battery. Assuming the barrier potential developed in the diode to be 0.5 V, find the value of current in the circuit in mA.

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Solution

Apply Kirchhoff's voltage law in the circuit,

$4.5 = 0.5 + 100 I$

$100 I = 4$

$I = \frac{4}{100} = 0.4 m A$

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