Question

A transistor is used in an amplifier circuit in common emitter mode. If the base current changes by 100μA, it brings a change of 10mA in collector current. If the load resistance is 2kΩ and input resistance is 1kΩ, the value of power gain is $x×10^4$. The value of x is _______.

Answer 1

The correct answer is: 2

Power gain

$=[\frac{\triangle{ic}}{\triangle{iB}}]×\frac{R_0}{R_i}$

$=[\frac{10^{-2}}{10^{-4}}]×\frac{2}{1}$

= 2 × 104

$⇒ x = 2$