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 the amplifier is

500

1000

1250

50

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Solution

1250

Voltage space gain space equals space straight beta space straight x space impedance space gain rightwards double arrow space 50 space equals space straight beta space straight x space 200 over 100 space rightwards double arrow space straight beta space equals space 25 Also comma space power space gain space equals space straight beta squared space equals space impedance space gain equals space left parenthesis 25 right parenthesis squared space straight x space 200 over 100 space equals space 1250

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