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·log10P1/P2. | |
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 |