Question

If the forward voltage in a semiconductor diode is changed from $0.5 \,V$ to $0.7\, V$, then the forward current changes by $1.0\, mA$. The forward resistance of diode junction will be

• A. $100\,\Omega$
• B. $120\,\Omega$
• C. $200\,\Omega$
• D. $240\,\Omega$

Answer 1

Answer: (C)

Forward resistance $=\frac{\Delta V}{\Delta I}$
$=\frac{0.7-0.5}{1.0 \times 10^{-3}}=200\, \Omega$