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A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω and an output impedance of 200Ω. The power gain of the amplifier is:

1. 500
2. 1000
3. 1250
4. 50

Correct answer: 1250

Solution

The power gain is given by the product of the voltage gain and the current gain. Current gain can be calculated as the square root of the ratio of output impedance to input impedance. Thus, power gain = voltage gain × (output impedance / input impedance) = 50 × (200 / 100) = 1250.

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