Question

The forward bias voltage of a diode is changed from $0.6\mathrm{to}0.7\mathrm{V}$. The current changes from$5\mathrm{mA}\mathrm{to}15\mathrm{mA}$. Then its forward bias resistance is

• A. $0.01\Omega$
• B. $0.1\Omega$
• C. $10\Omega$
• D. $100\Omega$

Answer 1

The correct option is C

$10\Omega$

Step 1: Given data and formula used

Change in the forward bias voltage $\left(∆V\right)=0.7-0.6=0.1V$

Change in current $\left(∆I\right)=15-5=10\text{mA}$

The forward bias resistance can be computed using the following formula,

$R=\frac{∆V}{∆I},∆V=$change in voltage, and $∆I=$Change in current

Step 2: Compute the resistance

Substitute the known values in the formula $R=\frac{∆V}{∆I}$,

$$\begin{gathered} R=\frac{0.1}{10\times {10}^{-3}} \\ R=10\Omega \end{gathered}$$

Thus, its forward bias resistance is $10\Omega$.

Hence, option C is the correct answer.