# An npn transistor operates as a common emitter amplifier with a power gain of 60dB .The input circuit resistance is 100 ohm and the output load resistance is 10000 ohm. The common emitter current gain is?

Mayank
368 Points
2 years ago
we know that  power gain = voltage gain * current gain  so now current gain =$\beta$  and voltage gain = ($\beta$* R)/r where R =output load resistance and r=input load resistance so now the power gain =($\beta$*$\beta$*R)/r so  now numerically we have

60=($\beta$*$\beta$*10000)/100 so from here we get  $\beta$*$\beta$=0.6  and hence $\beta$=0.77459