Question

The typical output characteristics curve for a transistor working in the common emitter configuration is shown in the figure

The estimated current gain from the figure is _____.

Answer 1

Step 1: Given Data,

From figure,

$\Delta I_c=2mA=2\times {10}^{-3}A$

$\Delta I_B=10uA=10\times {10}^{-6}$$A$

$I_C$ is the output current

$I_B$ is the input current

Step 2: Formula Used,

The current gain can be written in terms of output current and input current,

$\left(\beta \right)=\frac{\Delta I_c}{\Delta I_B}$

$\beta$ is the current gain

$I_C$ is the output current

$I_B$ is the input current

Step 3: Calculate the estimated current gain,

$\left(\beta \right)=\frac{\Delta I_c}{\Delta I_B}$

$$\begin{gathered} \beta =\frac{2\times {10}^{-3}}{10\times {10}^{-6}} \\ \beta =\frac{1}{5}\times {10}^3 \\ \beta =2\times {10}^2 \end{gathered}$$

$\beta =200$

Hence, the estimated current gain from the figure is 200.