Physics Question on Semiconductor electronics: materials, devices and simple circuits

Question

A common emitter amplifier has a voltage gain of $50$ , an input impedance of $100 \Omega$ and an output impedance of $200 \Omega$ The power gain of the amplifier is

Answer 1

Solution

Voltage gain $=\beta\left(\frac{ R _{\text {out }}}{ R _{\text {in }}}\right)$
$\Rightarrow \quad \beta=\frac{50 \times 100}{200}=25$
Power gain $=\beta($ Voltage gain $)$
$=(25)(50)=1250$