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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=PV=100×1030.5=0.2Ai = \frac{P}{V} = \frac{100 \times 10^{- 3}}{0.5} = 0.2A

∴ voltage drop across resistance = 1.5 – 0.5 = 1 V

R=10.2=5ΩR = \frac{1}{0.2} = 5\Omega