Q.

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

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a

7.5 Ω

b

10 Ω

c

5 Ω

d

1 Ω

answer is C.

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Detailed Solution

For Diode : P=VI                   ⇒100×10−3=0.5 I                                 ⇒I=0.2ASo, current 0.2 A should flow in the circuit.Now, Voltage across Resistor = 1.5 - 0.5 = 1.0 VOhm's Law : R=VI=1.5−0.50.2=5 Ω
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A diode used in the circuit shown in figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 mW . What should be the value of resistance ‘R’ connected in series with diode for obtaining maximum current ?