A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is:
Answer & explanation
Correct answer: option 2
Here,
Voltage gain = 50
Input resistance, $R_i =100W$
Output resistance, $R_o = 200W$
Resistance gain = $\frac{R_o}{R_i}=\frac{200Ω}{100Ω}=2$
Power gain = $\frac{(Voltage\,gain)^2}{Resistance\, gain}=\frac{50×50}{2}=1250$