Q. An amplifier has a voltage gain $A_{V}$ = 1000. The voltage gain in dB is
A) 30 dB
B) 60 dB
C) 3 dB
D) 20 dB
Explanation
(a) Voltage gain, $A_{V}$ = 1000
In dB, voltage gain
$A$ = 10${\ log}_{10}$ 1000 dB
= (10$\ \times 3$)$\ {\ log}_{10}$ 10 dB
= $\because\log_{10}{10 = 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.