For a common-emitter amplifier, the voltage gain is 40 . Its input and output impedances are 100Ω and 400Ω , respectively. The power gain of the CE amplifier will be

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Power gain = ( voltage gain ) × ( current gain ) ​ Current gain = Input current output current ​ = z i ​ V i ​ ​ z 0 ​ V 0 ​ ​ ​ = V i ​ V 0 ​ ​ ⋅ z 0 ​ z i ​ ​ = 400 40 × 100 ​ = 10 ​ Power gain = 40 × 10 = 400

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