Question

A common emitter amplifier has a voltage gain of $50$ and current gain is $25.$ The power gain of the amplifier is $125x.$ The value of $x$ is (integer only)

Answer 1

Given, $\text{voltage gain}{A}_V=50;\text{current gain}\beta =25$

$\because \text{AC power gain}=\frac{\Delta V_c\Delta i_c}{\Delta V_b\Delta i_b}$

$=\left(\frac{\Delta V_c}{\Delta V_i}\right)\times \left(\frac{\Delta i_c}{\Delta i_b}\right)=A_v\times {\beta }_{AC}$

$=50\times 25=1250$

$\therefore x=10$