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. 100

Answer

C

Explanation

Voltage gain `(A_(V))=beta((R_(L))/(r_(i)))`
`implies50=betaxx(200)/(100)impliesbeta=25`
Power gain `=beta^(2)xx(R_(L))/(r_(i))=(25)^(2)xx(200)/(100)=1250`.