Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 69

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71. A common emitter amplifier has a voltage gain of 50, an input impedance of $100 \Omega$ and an output impedance of $200 \Omega$. The power gain of the amplifier is

======= ####71. A common emitter amplifier has a voltage gain of 50, an input impedance of $100 \Omega$ and an output impedance of $200 \Omega$. The power gain of the amplifier is

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(b) 1000

(c) 1250

(d) 50

[2010, 2007]

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Answer:

Correct Answer: 71. (c)

Solution:

  1. (c) Power gain $=$ voltage gain $\times$ current gain

$=V_G \cdot I_G=\frac{V_0}{V_i} \cdot \frac{I_0}{I_i}$

$=\frac{V_0^{2}}{V_i^{2}} \cdot \frac{R_i}{R_0}=50 \times 50 \times \frac{100}{200}$

$=\frac{2500}{2}=1250$