Question

The V – I characteristic of a silicon diode is shows in figure. The resistance of the diode at $I_{D} = 15mA$ is

• A. $5\Omega$
• B. $10\Omega$
• C. $2\Omega$
• D. $20\Omega$

Answer 1

Answer: (B)

$10\Omega$

Answer 2

:

In diagram, at $I = 20mA,V = 0.8Vand$

At $I = 10mA,V = 0.7V$

$Br_{fb} = \frac{\Delta V}{\Delta I} = \frac{0.1V}{10mA} = 10\Omega$