A common emitter amplifier has a voltage gain of 50, an input impedance of `100Omega` and an output impedance of 200 `Omega`. The power gain of the amplifier is :-

Options

A. 500
B. 1000
C. 1250
D. 50

Answer

C

Explanation

Here, Voltage gain = 50 , Input resistance, `R_(i)=100Omega`
Output resistance, `R_(o)=200Omega`
Resistance gain `=(R_(o))/(R_(i))=(200Omega)/(100Omega)=2`
Power gain `=("(Voltage gain)"^(2))/("Resistance gain")=(50xx50)/(2)=1250`