Q. A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is
A) 50
B) 500
C) 1000
D) 1250
Explanation
[Solution from source] Voltage gain A_V = β × (R_out/R_in), so β = 50 × 100/200 = 25. Power gain = A_V × β = 50 × 25 = 1250. Taking the power gain equal to the voltage gain (50) ignores the current gain. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.