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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