What is Decibel?
It can also be defined as the difference between two power levels. But most commonly it is used to measure the relative loudness of sounds. One decibel is equal to 1/10 bel. Decibel is a dimensionless quantity as it is the logarithmic ratio.
The formula is given by
Lp = 10 log10( P/P0) dB
where
P and P0 are powers
For Current and Voltages, it is given by
Lp = 20 log10( X/X0) dB
where
X and X0 are either both voltages or both are currents
Difference between dB, dBM and dBi
Decibel is the unit of sound intensity. It is the ratio of two physical quantities and then the logarithm of the ratio is taken. It is also used in electricity to measure current, voltage, and power.
Table of Content
- What is Decibel
- Decibel Milliwatts (dBm)
- Decibel Relative to Isotropic Gain(dBi)
- Difference between dB, dBm, and dBi
- Solved Examples on dB, dBm, and dBi
- dB, dBm, and dBi- FAQs