Q.
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?
A) $1.5\ \Omega$
B) $5\ \Omega$
C) $6.67\ \Omega$
D) $200\ \Omega$
Explanation
(b) Current through circuit,
$I = \frac{P}{V} = \frac{100 \times 10^{- 3}}{0.5} = 0.2\ A.$
Voltage drop across $R = 1.5 - 0.5 = 1.0\ V$
Hence, $R = 1/0.2 = 5\Omega$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.