Question

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. `15Omega`
B. `5Omega`
C. `6.67Omega`
D. `200Omega`

Answer 1

Correct Answer - B
Current through circuit,
`I=(P)/(V)=(100xx10^(-3))/(0.5)=0.2A`
Voltage drop across `R=1.5-0.5=1.0V`
Hence, `R=1//0.2=5Omega`