Units Currencies
Constants
Units Home
Unit Conversion
List Units
List Categories
Currencies
Convert Units
SI System
Base Units
Derived Units
Prefixes
Numbers
Constants
Base-N
Fractions
Time / Decimal
Resources
Bibliography
Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

Design-2-Part

How OEM's can make their parts better, faster, and more efficient.

Quality Magazine

Techniques to improve quality on the shop floor and in manufacturing planning.

Machine Design

How-to, in-depth technical articles for machine design engineers

more free magazines
 
decibel (voltage)
Symbol:  dB (voltage) 
Category:  Logarithm of a ratio 
SI Equivalent:  0.5 dB
Dimension nil (log) 
 
Notes
Named after the telephone inventor, Alexander Graham Bell (1847-1922), the decibel is a unit for expressing the ratio between two amounts of acoustic power. When used to express the ratio of the magnitudes of two electric voltages, electric currents, and sound pressure,it is defined as 20┬Ělog10P1/P2.
Convert     dB (voltage)  
1 dB (voltage) =
Logarithm of a ratio
  Symbol Unit Name
5×10-2  B (power)  bel (power) 
0.1  B (voltage)  bel (voltage) 
0.5  dB (power)  decibel (power) 
0.115129  NP  neper 
Glossary