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The diode used in the circuit shown in t...

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 fo `100` milliwatts. What should be the value of the resistor `R`, connected in series with the diode for obtaining maximum current?

A

`1.5Omega`

B

`5Omega`

C

`6.67Omega`

D

`200Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
Here, voltage drop across diode,
`V_(D)=0.5V`
Maximum power rating of diode,
`P=100mW=100xx10^(-3)W`
The current in the diode is
`I=(P)/(V_(D))=(100xx10^(-3)W)/(0.5V)=0.2A`
The voltage drop across R,
`V_(R)=1.5V-0.5V=1V`
The resistance `R=(V_(R))/(I)=(1V)/(0.2A)=5Omega`
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