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NEET 1997 (AIPMT) · P-N Junction Diode

P-N Junction Diode question from NEET 1997 (AIPMT)

Q127NEET 1997 · AIPMTMedium

P-N Junction Diode

The diode used in the circuit shown in the figure has a constant voltage drop at $0.5\text{ V}$ at all currents and a maximum power rating of 100 milli watts. What should be the value of the resistor $R$ , connected in series with diode for obtaining maximum current?

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Answer: (c)

Maximum diode power $P = V_d I$ : $I_{max} = \dfrac{100\times 10^{-3}}{0.5} = 0.2$ A
Voltage across $R$ $= 1.5 - 0.5 = 1.0$ V
$R = \dfrac{1.0}{0.2} = 5\ \Omega$
So the answer is (c) $5\ \Omega$ .

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