Question
Question: The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all curren...
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

A
1.5 Ω
B
5 Ω
C
6.67 Ω
D
200 Ω
Answer
5 Ω
Explanation
Solution
The current through circuit i=VP=0.5100×10−3=0.2A
∴ voltage drop across resistance = 1.5 – 0.5 = 1 V
⇒ R=0.21=5Ω