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 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 W
• B. 5 W
• C. 6.67 W
• D. 200 W

Answer 1

Answer: (B)

5 W

Answer 2

P = VI ̃ I = $\frac{P}{V}$= $\frac{100}{0.5}$× 10^–3 , I = $\frac{1}{5}$

I = $\frac{V_{net}}{R_{net}}$= $\frac{1.5–0.5}{R}$= $\frac{1}{R}$

R = 5