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 mW. What should be the value of the resistor R, connected in series with the diode, for obtaining maximum current put less I. ?

Options

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

Answer

C

Explanation

Current in the circuit
`l=(P)/(V)=(100xx10^(-3))/(0.5)=200xx10^(-3)A`
Voltage across resistance R,
`V'=1.5-0.5=1.0" V"`
`:.` Resistance
`R=(V')/(l)=(1)/(200xx10^(-3))=5Omega`