A transistor has a current amplification factor (current gain) of 50. In a common emitter amplifier circuit, the collector resistance is chosen as 5 Ω and the input resistance is 1 Ω. The output voltage if input voltage is 0.01 V is

Question

A transistor has a current amplification factor (current gain) of 50. In a common emitter amplifier circuit, the collector resistance is chosen as 5 Ω and the input resistance is 1 Ω. The output voltage if input voltage is 0.01 V is (A) -2 V (B) -5 V (C) -2.5 V (D) - 1 V

Tardigrade Admin · Accepted Answer

The voltage gain of a common emitter amplifier Av = - (β R0/Ri)or (V0/Vi) = - (β RC/RB) Output voltage, ∴ V0 = -(β RC Vi/RB) = -(50× 5× 0.01/1) = - 2.5 V

Q. A transistor has a current amplification factor (current gain) of $50$ . In a common emitter amplifier circuit, the collector resistance is chosen as $5 Ω$ and the input resistance is $1 Ω$ . The output voltage if input voltage is $0.01 V$ is

$- 2 V$

$- 5 V$

$- 2.5 V$

$- 1 V$

The voltage gain of a common emitter amplifier
$A_{v} = - \frac{β R _{0}}{R _{i}}$ or
$\frac{V _{0}}{V _{i}} = - \frac{β R _{C}}{R _{B}}$
Output voltage,
$∴ V_{0} = - \frac{β R _{C} V _{i}}{R _{B}}$
$= - \frac{50 \times 5 \times 0.01}{1}$
$= - 2.5 V$

Q. A transistor has a current amplification factor (current gain) of 50. In a common emitter amplifier circuit, the collector resistance is chosen as 5Ω and the input resistance is 1Ω. The output voltage if input voltage is 0.01V is

−2V

−5V

−2.5V

−1V