First slide

P-N junction diode

Question

The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistance R, connected in series with the diode for obtaining maximum current?

Moderate

A

$1.5 Ω$
B

$5 Ω$
C

$6.67 Ω$
D

$200 Ω$

Solution

The current through circuit
$i = \frac{P}{V} = \frac{100 \times 10^{- 3}}{0.5} = 0.2 A$
$∴$ Voltage drop across resistance = 1.5 - 0.5 = 1 V
$\Rightarrow R = \frac{1}{0.2} = 5 Ω$

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