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Q.

The diode used in circuit  shown in  figure  has a constant voltage  drop of 0.3V at all current and  a maximum  power rating  of 300 milli watt.  What should be the value    of  the resistor R   connected in series  with the diode for  obtaining maximum   current

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a

1.2Ω

b

12Ω

c

2.4Ω

d

5Ω

answer is A.

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Detailed Solution

The current through the circuit  is same current through the diode. i=PV=300×10−30.3=1A Voltage  drop across resistance, VR  = 1.5-0.3 =1.2V So, R=VRi=1.21=1.2Ω
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The diode used in circuit  shown in  figure  has a constant voltage  drop of 0.3V at all current and  a maximum  power rating  of 300 milli watt.  What should be the value    of  the resistor R   connected in series  with the diode for  obtaining maximum   current