Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 69

71. 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

(a) 500

(b) 1000

(c) 1250

(d) 50

[2010, 2007]

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Answer:

Correct Answer: 71. (c)

Solution:

  1. (c) Power gain = voltage gain × current gain

=VGIG=V0ViI0Ii

=V02Vi2RiR0=50×50×100200

=25002=1250



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