Question

The diode used in the circuit shown in fig. has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatt. What should be the value of the resistor R, connected in series with the diode, for obtaining maximum current?

• A. $1.5\Omega$
• B. $5\Omega$
• C. $6.67\Omega$
• D. $200\Omega$

Answer 1

The correct option is B

$5\Omega$

$I=\frac{100\times {10}^{-3}}{0.5}A=0.2A$

$R=\frac{1}{0.2}\Omega =5\Omega$