Question

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

• A. 0.62 V
• B. 6.2 V
• C. 62 V
• D. 620 V

Hint:

A transistor amplifier doesn't just amplify current; it relies heavily on transferring that current from a low-resistance input circuit to a high-resistance output circuit to achieve massive voltage amplification.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
In a Common Emitter (CE) amplifier, the voltage gain ($A_v$) is the product of current gain ($\beta$) and the resistance gain ($R_{out}/R_{in}$).

Step 2: Formula Application:
Voltage Gain $A_v = \beta \times \frac{R_C}{R_{in}}$. $A_v = 62 \times \frac{5000}{500} = 62 \times 10 = 620$.

Step 3: Explanation:
Output Voltage $V_{out} = A_v \times V_{in}$. $V_{out} = 620 \times 0.01 = 6.2$ V.

Step 4: Final Answer:
The output voltage is 6.2 V.