# What is Bel and dB explain?

## What is Bel and dB explain?

The decibel is defined as one tenth of a bel where one bel represents a difference in level between two intensities I1, I0 where one is ten times greater than the other. Thus, the intensity level is the comparison of one intensity to another and may be expressed: Intensity level = 10 log10 (I1 /I0) (dB)

## How is dB calculated?

The most basic form for deciBel calculations is a comparison of power levels. As might be expected it is ten times the logarithm of the output divided by the input. The factor ten is used because deciBels rather than Bels are used.

**What is dB measurement?**

decibel (dB), unit for expressing the ratio between two physical quantities, usually amounts of acoustic or electric power, or for measuring the relative loudness of sounds. One decibel (0.1 bel) equals 10 times the common logarithm of the power ratio.

**What does 0 decibels mean?**

The lowest hearing decibel level is 0 dB, which indicates nearly total silence and is the softest sound that the human ear can hear.

### Is decibel scale logarithmic?

In decibels, this ratio is expressed by taking its logarithm (to base 10) and multiplying by 10. Because the decibel scale is a logarithmic one, doubling the gain does not double the decibel value.

### Why is dB used?

The decibel (dB) is a logarithmic unit used to measure sound level. It is also widely used in electronics, signals and communication. The dB is a logarithmic way of describing a ratio. The ratio may be power, sound pressure, voltage or intensity or several other things.

**How do you convert dB to ratio?**

dB to power ratio conversion The power P2 is equal to the reference power P1 times 10 raised by the gain in GdB divided by 10. P2 is the power level. P1 is the referenced power level. GdB is the power ratio or gain in dB.

**Why do we use dB?**

## How do you read decibels?

On the decibel scale, the quietest audible sound (perceived near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB, 40 dB and so on.