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Question

If an amplifier has peak output voltage of 10 V across a load resistor of 1 kΩ . If the input power to amplifier is 100 μW , the Power gain will be

A
225
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B
250
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C
500
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D
125
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Solution

The correct option is D 125
Given that Pi=100μ watt
and V0 = 10 V peak to peak
V0 = 5 cosωt
RL=1KΩ

then P0=V2rmsRL
= 12.5 mW

so, power gain = P0Pi=12.5mW0.1mW = 125

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