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 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_(0)=200Omega`
Resistance gain `=(R_(0))/(R_(i))=(200Omega)/(100Omega)=2`
`"Power gain"=(("voltage gain")^(2))/("resistance gain")=(50xx50)/(2)=1250`