Question

In common emitter amplifier, the current gain is $62$ . The collector resistance and input resistance are $5k\Omega$ and $500\Omega$ respectively. If the input voltage is $0.01V$ , the output voltage is

• A. $0.62V$
• B. $6.2V$
• C. $62V$
• D. $620V$
• E. $0.01V$

Answer 1

Answer: (B)

Voltage gain = resistance gain current
$\times$ gain or $\frac{V_{out}}{V_{in}}=\frac{R_{out}}{R_{in}}\times \beta$
or $V_{out}=\frac{R_{out}}{R_{in}}\times \beta \times V_{in}$
$\therefore$ $V_{out}=\frac{5000}{500}\times 62\times 0.01=6.2V$