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:

1000 1250 100 5000

1250

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 = $\frac{(Voltage\,gain)^2}{Resistance\, gain}=\frac{50×50}{2}=1250$