First slide

Transistor

Question

What is the voltage gain of a common emitter amplifier where input resistance is $3 Ω$ and load resistance is $24 Ω ?$ (given, $β = 6$ )

Moderate

A

2.2
B

1.2
C

4.8
D

48

Solution

Given that,
Input resistance
$R_{i} = 3 Ω$
output resistance
$R_{\circ} = 24 Ω$
$β = 6$
The voltage gain is defined as the product of the current gain and the ratio of the output resistance of the collector to the input resistance of the base circuits.
$A_{V} = β \frac{R_{\circ}}{R_{in}}$
$A_{v} = 6 \times \frac{24}{3}$
A_V = 48

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