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 resistor `R`, connected in series with the diode for obtaining maximum current?

Options

A. `1.5Omega`
B. `5 Omega`
C. `6.67 Omega`
D. `200 Omega`

Answer

B

Explanation

Current = `(P)/(V)=(100xx10^(-3))/(0.5)=0.2A`
Now, Current = `(V-0.5)/(R)`
implies `0.2R=1.5-0.5 implies R=(1)/(0.2)=5Omega`